Three Dialogues Between Hylas and Philonous
George Berkeley
1713
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Copyright 1996, James Fieser (jfieser@utm.edu). See end note for details on
copyright and editing conventions. This text file is based on the 1910 Harvard
Classics edition of Berkeley's Three Dialogues. Pagenation follows T.E.
Jessop's 1949 edition of Three Dialogues, in The Works of George Berkeley,
Vol. 2. This is a working draft; please report errors.1
Contents
Dialogue 1
Dialogue 2
Dialogue 3
Notes
THREE DIALOGUES
Between
HYLAS AND PHILONOUS
The Design of which is Plainly to Demonstrate the Reality and Perfection
of
HUMAN KNOWLEDGE
The Incorporeal Nature of the
SOUL
And the Immediate Providence of a
DEITY
In Opposition to
SCEPTICS AND ATHEISTS
Also to Open a Method for Rendering the Sciences More Easy, Useful, and
Compendious
{171}
Philonous. Good morrow, Hylas: I did not expect to find you abroad
so early.
Hylas. It is indeed something unusual; but my thoughts were so taken
up with a subject I was discoursing of last night, that finding I could not
sleep, I resolved to rise and take a turn in the garden.
Phil. It happened well, to let you see what innocent and agreeable
pleasures you lose every morning. Can there be a pleasanter time of the day,
or a more delightful season of the year? That purple sky, those wild but sweet
notes of birds, the fragrant bloom upon the trees and flowers, the gentle influence
of the rising sun, these and a thousand nameless beauties of nature inspire
the soul with secret transports; its faculties too being at this time fresh
and lively, are fit for those meditations, which the solitude of a garden and
tranquillity of the morning naturally dispose us to. But I am afraid I interrupt
your thoughts: for you seemed very intent on something.
Hyl. It is true, I was, and shall be obliged to you if you will permit
me to go on in the same vein; not that I would by any means deprive myself of
your company, for my thoughts always flow more easily in conversation with a
friend, than when I am alone: but my request is, that you would suffer me to
impart my reflexions to you.
Phil. With all my heart, it is what I should have requested myself
if you had not prevented me.
Hyl. I was considering the odd fate of those men who have in all ages,
through an affectation of being distinguished from the vulgar, or some unaccountable
turn of thought, pretended either to believe nothing at all, or to believe the
most extravagant things in the world. This however might be borne, if their
paradoxes and scepticism did not draw after them some consequences of general
disadvantage to mankind. But the mischief lieth {172} here; that when men of
less leisure see them who are supposed to have spent their whole time in the
pursuits of knowledge professing an entire ignorance of all things, or advancing
such notions as are repugnant to plain and commonly received principles, they
will be tempted to entertain suspicions concerning the most important truths,
which they had hitherto held sacred and unquestionable.
Phil. I entirely agree with you, as to the ill tendency of the affected
doubts of some philosophers, and fantastical conceits of others. I am even so
far gone of late in this way of thinking, that I have quitted several of the
sublime notions I had got in their schools for vulgar opinions. And I give it
you on my word; since this revolt from metaphysical notions to the plain dictates
of nature and common sense, I find my understanding strangely enlightened, so
that I can now easily comprehend a great many things which before were all mystery
and riddle.
Hyl. I am glad to find there was nothing in the accounts I heard of
you.
Phil. Pray, what were those?
Hyl. You were represented, in last night's conversation, as one who
maintained the most extravagant opinion that ever entered into the mind of man,
to wit, that there is no such thing as material substance in the world.
Phil. That there is no such thing as what philosophers call material
substance, I am seriously persuaded: but, if I were made to see anything
absurd or sceptical in this, I should then have the same reason to renounce
this that I imagine I have now to reject the contrary opinion.
Hyl. What I can anything be more fantastical, more repugnant to Common
Sense, or a more manifest piece of Scepticism, than to believe there is no such
thing as matter?
Phil. Softly, good Hylas. What if it should prove that you, who hold
there is, are, by virtue of that opinion, a greater sceptic, and maintain more
paradoxes and repugnances to Common Sense, than I who believe no such thing?
Hyl. You may as soon persuade me, the part is greater than the whole,
as that, in order to avoid absurdity and Scepticism, I should ever be obliged
to give up my opinion in this point.
Phil. Well then, are you content to admit that opinion for true, which
upon examination shall appear most agreeable to Common Sense, and remote from
Scepticism?
Hyl. With all my heart. Since you are for raising disputes {173} about
the plainest things in nature, I am content for once to hear what you have to
say.
Phil. Pray, Hylas, what do you mean by a sceptic?
Hyl. I mean what all men mean -- one that doubts of everything.
Phil. He then who entertains no doubts concerning some particular point,
with regard to that point cannot be thought a sceptic.
Hyl. I agree with you.
Phil. Whether doth doubting consist in embracing the affirmative or
negative side of a question?
Hyl. In neither; for whoever understands English cannot but know that
doubting signifies a suspense between both.
Phil. He then that denies any point, can no more be said to doubt of
it, than he who affirmeth it with the same degree of assurance.
Hyl. True.
Phil. And, consequently, for such his denial is no more to be esteemed
a sceptic than the other.
Hyl. I acknowledge it.
Phil. How cometh it to pass then, Hylas, that you pronounce me a
sceptic, because I deny what you affirm, to wit, the existence of Matter?
Since, for aught you can tell, I am as peremptory in my denial, as you in your
affirmation.
Hyl. Hold, Philonous, I have been a little out in my definition; but
every false step a man makes in discourse is not to be insisted on. I said indeed
that a sceptic was one who doubted of everything; but I should have added,
or who denies the reality and truth of things.
Phil. What things? Do you mean the principles and theorems of sciences?
But these you know are universal intellectual notions, and consequently independent
of Matter. The denial therefore of this doth not imply the denying them.
Hyl. I grant it. But are there no other things? What think you of distrusting
the senses, of denying the real existence of sensible things, or pretending
to know nothing of them. Is not this sufficient to denominate a man a sceptic?
Phil. Shall we therefore examine which of us it is that denies the
reality of sensible things, or professes the greatest ignorance of them; since,
if I take you rightly, he is to be {174} esteemed the greatest sceptic?
Hyl. That is what I desire.
Phil. What mean you by Sensible Things?
Hyl. Those things which are perceived by the senses. Can you imagine
that I mean anything else?
Phil. Pardon me, Hylas, if I am desirous clearly to apprehend your
notions, since this may much shorten our inquiry. Suffer me then to ask you
this farther question. Are those things only perceived by the senses which are
perceived immediately? Or, may those things properly be said to be sensible
which are perceived mediately, or not without the intervention of others?
Hyl. I do not sufficiently understand you.
Phil. In reading a book, what I immediately perceive are the letters;
but mediately, or by means of these, are suggested to my mind the notions of
God, virtue, truth, &c. Now, that the letters are truly sensible things, or
perceived by sense, there is no doubt: but I would know whether you take the
things suggested by them to be so too.
Hyl. No, certainly: it were absurd to think God or virtue
sensible things; though they may be signified and suggested to the mind by sensible
marks, with which they have an arbitrary connexion.
Phil. It seems then, that by sensible things you mean those
only which can be perceived immediately by sense?
Hyl. Right.
Phil. Doth it not follow from this, that though I see one part of the
sky red, and another blue, and that my reason doth thence evidently conclude
there must be some cause of that diversity of colours, yet that cause cannot
be said to be a sensible thing, or perceived by the sense of seeing?
Hyl. It doth.
Phil. In like manner, though I hear variety of sounds, yet I cannot
be said to hear the causes of those sounds?
Hyl. You cannot.
Phil. And when by my touch I perceive a thing to be hot and heavy,
I cannot say, with any truth or propriety, that I feel the cause of its heat
or weight?
Hyl. To prevent any more questions of this kind, I tell you once for
all, that by sensible things I mean those only which are perceived by
sense; and that in truth the senses perceive nothing which they do not perceive
immediately: for they make no {175} inferences. The deducing therefore
of causes or occasions from effects and appearances, which alone are perceived
by sense, entirely relates to reason.
Phil. This point then is agreed between us -- That sensible things
are those only which are immediately perceived by sense. You will farther
inform me, whether we immediately perceive by sight anything beside light, and
colours, and figures; or by hearing, anything but sounds; by the palate, anything
beside tastes; by the smell, beside odours; or by the touch, more than tangible
qualities.
Hyl. We do not.
Phil. It seems, therefore, that if you take away all sensible qualities,
there remains nothing sensible?
Hyl. I grant it.
Phil. Sensible things therefore are {250} nothing else but so many
sensible qualities, or combinations of sensible qualities?
Hyl. Nothing else.
Phil. Heat then is a sensible thing?
Hyl. Certainly.
Phil. Doth the reality of sensible things consist in being perceived?
or, is it something distinct from their being perceived, and that bears no relation
to the mind?
Hyl. To exist is one thing, and to be perceived is another.
Phil. I speak with regard to sensible things only. And of these I ask,
whether by their real existence you mean a subsistence exterior to the mind,
and distinct from their being perceived?
Hyl. I mean a real absolute being, distinct from, and without any relation
to, their being perceived.
Phil. Heat therefore, if it be allowed a real being, must exist without
the mind?
Hyl. It must.
Phil. Tell me, Hylas, is this real existence equally compatible to
all degrees of heat, which we perceive; or is there any reason why we should
attribute it to some, and deny it to others? And if there be, pray let me know
that reason.
Hyl. Whatever degree of heat we perceive by sense, we may be sure the
same exists in the object that occasions it.
Phil. What! the greatest as well as the least?
Hyl. I tell you, the reason is plainly the same in respect of
both. They are both perceived by sense; nay, the greater degree of heat is more
sensibly perceived; and consequently, if there is {176} any difference, we are
more certain of its real existence than we can be of the reality of a lesser
degree.
Phil. But is not the most vehement and intense degree of heat a very
great pain?
Hyl. No one can deny it.
Phil. And is any unperceiving thing capable of pain or pleasure?
Hyl. No, certainly.
Phil. Is your material substance a senseless being, or a being endowed
with sense and perception?
Hyl. It is senseless without doubt.
Phil. It cannot therefore be the subject of pain?
Hyl. By no means.
Phil. Nor consequently of the greatest heat perceived by sense, since
you acknowledge this to be no small pain?
Hyl. I grant it.
Phil. What shall we say then of your external object; is it a material
Substance, or no?
Hyl. It is a material substance with the sensible qualities inhering
in it.
Phil. How then can a great heat exist in it, since you own it cannot
in a material substance? I desire you would clear this point.
Hyl. Hold, Philonous, I fear I was out in yielding intense heat to
be a pain. It should seem rather, that pain is something distinct from heat,
and the consequence or effect of it.
Phil. Upon putting your hand near the fire, do you perceive one simple
uniform sensation, or two distinct sensations?
Hyl. But one simple sensation.
Phil. Is not the heat immediately perceived?,
Hyl. It is.
Phil. And the pain?
Hyl. True.
Phil. Seeing therefore they are both immediately perceived at the same
time, and the fire affects you only with one simple or uncompounded idea, it
follows that this same simple idea is both the intense heat immediately perceived,
and the pain; and, consequently, that the intense heat immediately perceived
is nothing distinct from a particular sort of pain.
Hyl. It seems so.
Phil. Again, try in your thoughts, Hylas, if you can conceive a vehement
sensation to be without pain or pleasure. {177}
Hyl. I cannot.
Phil. Or can you frame to yourself an idea of sensible pain or pleasure
in general, abstracted from every particular idea of heat, cold, tastes, smells?
&c.
Hyl. I do not find that I can.
Phil. Doth it not therefore follow, that sensible pain is nothing distinct
from those sensations or ideas, in an intense degree?
Hyl. It is undeniable; and, to speak the truth, I begin to suspect
a very great heat cannot exist but in a mind perceiving it.
Phil. What! are you then in that sceptical state of suspense, between
affirming and denying?
Hyl. I think I may be positive in the point. A very violent and painful
heat cannot exist without the mind.
Phil. It hath not therefore according to you, any real being?
Hyl. I own it.
Phil. Is it therefore certain, that there is no body in nature really
hot?
Hyl. I have not denied there is any real heat in bodies. I only say,
there is no such thing as an intense real heat.
Phil. But, did you not say before that all degrees of heat were equally
real; or, if there was any difference, that the greater were more undoubtedly
real than the lesser?
Hyl. True: but it was because I did not then consider the ground there
is for distinguishing between them, which I now plainly see. And it is this:
because intense heat is nothing else but a particular kind of painful sensation;
and pain cannot exist but in a perceiving being; it follows that no intense
heat can really exist in an unperceiving corporeal substance. But this is no
reason wh' we should deny heat in an inferior degree to exist in such a substance.
Phil. But how shall we be able to discern those degrees of heat which
exist only in the mind from those which exist without it?
Hyl. That is no difficult matter. You know the least pain cannot exist
unperceived; whatever, therefore, degree of heat is a pain exists only in the
mind. But, as for all other degrees of heat, nothing obliges us to think the
same of them.
Phil. I think you granted before that no unperceiving being was capable
of pleasure, any more than of pain.
Hyl. I did. {178}
Phil. And is not warmth, or a more gentle degree of heat than what
causes uneasiness, a pleasure?
Hyl. What then?
Phil. Consequently, it cannot exist without the mind in an unperceiving
substance, or body.
Hyl. So it seems.
Phil. Since, therefore, as well those degrees of heat that are not
painful, as those that are, can exist only in a thinking substance; may we not
conclude that external bodies are absolutely incapable of any degree of heat
whatsoever?
Hyl. On second thoughts, I do not think it so evident that warmth is
a pleasure as that a great degree of heat is a pain.
Phil. I do not pretend that warmth is as great a pleasure as
heat is a pain. But, if you grant it to be even a small pleasure, it serves
to make good my conclusion.
Hyl. I could rather call it an indolence. It seems to be nothing
more than a privation of both pain and pleasure. And that such a quality or
state as this may agree to an unthinking substance, I hope you will not deny.
Phil. If you are resolved to maintain that warmth, or a gentle degree
of heat, is no pleasure, I know not how to convince you otherwise than by appealing
to your own sense. But what think you of cold?
Hyl. The same that I do of heat. An intense degree of cold is a pain;
for to feel a very great cold, is to perceive a great uneasiness: it cannot
therefore exist without the mind; but a lesser degree of cold may, as well as
a lesser degree of heat.
Phil. Those bodies, therefore, upon whose application to our own, we
perceive a moderate degree of heat, must be concluded to have a moderate degree
of heat or warmth in them; and those, upon whose application we feel a like
degree of cold, must be thought to have cold in them.
Hyl. They must.
Phil. Can any doctrine be true that necessarily leads a man into an
absurdity?
Hyl. Without doubt it cannot.
Phil. Is it not an absurdity to think that the same thing should be
at the same time both cold and warm?
Hyl. It is.
Phil. Suppose now one of your hands hot, and the other cold, and that
they are both at once put into the same vessel of {179} water, in an intermediate
state; will not the water seem cold to one hand, and warm to the other?
Hyl. It will.
Phil. Ought we not therefore, by your principles, to conclude it is
really both cold and warm at the same time, that is, according to your own concession,
to believe an absurdity?
Hyl. I confess it seems so.
Phil. Consequently, the principles themselves are false, since you
have granted that no true principle leads to an absurdity.
Hyl. But, after all, can anything be more absurd than to say, there
is no heat in the fire?
Phil. To make the point still clearer; tell me whether, in two cases
exactly alike, we ought not to make the same judgment?
.Hyl. We ought.
Phil. When a pin pricks your finger, doth it not rend and divide the
fibres of your flesh?
Hyl. It doth.
Phil. And when a coal burns your finger, doth it any more?
Hyl. It doth not.
Phil. Since, therefore, you neither judge the sensation itself occasioned
by the pin, nor anything like it to be in the pin; you should not, conformably
to what you have now granted, judge the sensation occasioned by the fire, or
anything like it, to be in the fire.
Hyl. Well, since it must be so, I am content to yield this point, and
acknowledge that heat and cold are only sensations existing in our minds. But
there still remain qualities enough to secure the reality of external things.
Phil. But what will you say, Hylas, if it shall appear that the case
is the same with regard to all other sensible qualities, and that they can no
more be supposed to exist without the mind, than heat and cold?
Hyl. Then indeed you will have done something to the purpose; but that
is what I despair of seeing proved.
Phil. Let us examine them in order. What think you of tastes,
do they exist without the mind, or no?
Hyl. Can any man in his senses doubt whether sugar is sweet, or wormwood
bitter?
Phil. Inform me, Hylas. Is a sweet taste a particular kind of pleasure
or pleasant sensation, or is it not? {180}
Hyl. It is.
Phil. And is not bitterness some kind of uneasiness or pain?
Hyl. I grant it.
Phil. If therefore sugar and wormwood are unthinking corporeal substances
existing without the mind, how can sweetness and bitterness, that is, Pleasure
and pain, agree to them?
Hyl. Hold, Philonous, I now see what it was delude time. You asked
whether heat and cold, sweetness at were not particular sorts of pleasure and
pain; to which simply, that they were. Whereas I should have thus distinguished:
those qualities, as perceived by us, are pleasures or pair existing in the external
objects. We must not therefore conclude absolutely, that there is no heat in
the fire, or sweetness in the sugar, but only that heat or sweetness, as perceived
by us, are not in the fire or sugar. What say you to this?
Phil. I say it is nothing to the purpose. Our discourse proceeded altogether
concerning sensible things, which you defined to be, the things we immediately
perceive by our senses. Whatever other qualities, therefore, you speak of
as distinct from these, I know nothing of them, neither do they at all belong
to the point in dispute. You may, indeed, pretend to have discovered certain
qualities which you do not perceive, and assert those insensible qualities exist
in fire and sugar. But what use can be made of this to your present purpose,
I am at a loss to conceive. Tell me then once more, do you acknowledge that
heat and cold, sweetness and bitterness (meaning those qualities which are perceived
by the senses), do not exist without the mind?
Hyl. I see it is to no purpose to hold out, so I give up the cause
as to those mentioned qualities. Though I profess it sounds oddly, to say that
sugar is not sweet.
Phil. But, for your farther satisfaction, take this along with you:
that which at other times seems sweet, shall, to a distempered palate, appear
bitter. And, nothing can be plainer than that divers persons perceive different
tastes in the same food; since that which one man delights in, another abhors.
And how could this be, if the taste was something really inherent in the food?
Hyl. I acknowledge I know not how.
Phil. In the next place, odours are to be considered. And, with
regard to these, I would fain know whether what hath {181} been said of tastes
doth not exactly agree to them? Are they not so many pleasing or displeasing
sensations?
Hyl. They are.
Phil. Can you then conceive it possible that they should exist in an
unperceiving thing?
Hyl. I cannot.
Phil. Or, can you imagine that filth and ordure affect those brute
animals that feed on them out of choice, with the same smells which we perceive
in them?
Hyl. By no means.
Phil. May we not therefore conclude of smells, as of the other forementioned
qualities, that they cannot exist in any but a perceiving substance or mind?
Hyl. I think so.
Phil. Then as to sounds, what must we think of them: are they
accidents really inherent in external bodies, or not?
Hyl. That they inhere not in the sonorous bodies is plain from hence:
because a bell struck in the exhausted receiver of an air-pump sends forth no
sound. The air, therefore, must be thought the subject of sound.
Phil. What reason is there for that, Hylas?
Hyl. Because, when any motion is raised in the air, we perceive a sound
greater or lesser, according to the air's motion; but without some motion in
the air, we never hear any sound at all.
Phil. And granting that we never hear a sound but when some motion
is produced in the air, yet I do not see how you can infer from thence, that
the sound itself is in the air.
Hyl. It is this very motion in the external air that produces in the
mind the sensation of sound. For, striking on the drum of the ear, it
causeth a vibration, which by the auditory nerves being communicated to the
brain, the soul is thereupon affected with the sensation called sound.
Phil. What! is sound then a sensation?
Hyl. I tell you, as perceived by us, it is a particular sensation in
the mind.
Phil. And can any sensation exist without the mind?
Hyl. No, certainly.
Phil. How then can sound, being a sensation, exist in the air, if by
the air you mean a senseless substance existing without the mind?
Hyl. You must distinguish, Philonous, between sound as it is {182}
perceived by us, and as it is in itself; or (which is the same thing) between
the sound we immediately perceive, and that which exists without us. The former,
indeed, is a particular kind of sensation, but the latter is merely a vibrative
or undulatory motion the air.
Phil. I thought I had already obviated that distinction, by answer
I gave when you were applying it in a like case before. But, to say no more
of that, are you sure then that sound is really nothing but motion?
Hyl. I am.
Phil. Whatever therefore agrees to real sound, may with truth be attributed
to motion?
Hyl. It may.
Phil. It is then good sense to speak of motion as of a thing
that is loud, sweet, acute, or grave.
Hyl. I see you are resolved not to understand me. Is it not
evident those accidents or modes belong only to sensible sound, or sound
in the common acceptation of the word, but not to sound in the real
and philosophic sense; which, as I just now told you, is nothing but a certain
motion of the air?
Phil. It seems then there are two sorts of sound -- the one vulgar,
or that which is heard, the other philosophical and real?
Hyl. Even so.
Phil. And the latter consists in motion?
Hyl. I told you so before.
Phil. Tell me, Hylas, to which of the senses, think you, the idea of
motion belongs? to the hearing?
Hyl. No, certainly; but to the sight and touch.
Phil. It should follow then, that, according to you, real sounds may
possibly be seen or felt, but never heard.
Hyl. Look you, Philonous, you may, if you please, make a jest of my
opinion, but that will not alter the truth of things. I own, indeed, the inferences
you draw me into sound something oddly; but common language, you know, is framed
by, and for the use of the vulgar: we must not therefore wonder if expressions
adapted to exact philosophic notions seem uncouth and out of the way.
Phil. Is it come to that? I assure you, I imagine myself to have gained
no small point, since you make so light of departing from common phrases and
opinions; it being a main part of our inquiry, to examine whose notions are
widest of the {183} common road, and most repugnant to the general sense of
the world. But, can you think it no more than a philosophical paradox, to say
that real sounds are never heard, and that the idea of them is obtained
by some other sense? And is there nothing in this contrary to nature and the
truth of things?
Hyl. To deal ingenuously, I do not like it. And, after the concessions
already made, I had as well grant that sounds too have no real being without
the mind.
Phil. And I hope you will make no difficulty to acknowledge the same
of colours.
Hyl. Pardon me: the case of colours is very different. Can anything
be plainer than that we see them on the objects?
Phil. The objects you speak of are, I suppose, corporeal Substances
existing without the mind?
Hyl. They are.
Phil. And have true and real colours inhering in them?
Hyl. Each visible object hath that colour which we see in it.
Phil. How! is there anything visible but what we perceive by sight?
Hyl. There is not.
Phil. And, do we perceive anything by sense which we do not perceive
immediately?
Hyl. How often must I be obliged to repeat the same thing? I tell you,
we do not.
Phil. Have patience, good Hylas; and tell me once more, whether there
is anything immediately perceived by the senses, except sensible qualities.
I know you asserted there was not; but I would now be informed, whether you
still persist in the same opinion.
Hyl. I do.
Phil. Pray, is your corporeal substance either a sensible quality,
or made up of sensible qualities?
Hyl. What a question that is! who ever thought it was?
Phil. My reason for asking was, because in saying, each visible
object hath that colour which we see in it, you make visible objects to
be corporeal substances; which implies either that corporeal substances are
sensible qualities, or else that there is something besides sensible qualities
perceived by sight: but, as this point was formerly agreed between us, and is
still maintained by you, it is a clear consequence, that your corporeal substance
is nothing distinct from sensible qualities. {184}
Hyl. You may draw as many absurd consequences as you please, and endeavour
to perplex the plainest things; but you shall never persuade me out of my senses.
I clearly understand my own meaning.
Phil. I wish you would make me understand it too. But, since you are
unwilling to have your notion of corporeal substance examined, I shall urge
that point no farther. Only be pleased to let me know, whether the same colours
which we see exist in external bodies, or some other.
Hyl. The very same.
Phil. What! are then the beautiful red and purple we see on yonder
clouds really in them? Or do you imagine they have in themselves any other form
than that of a dark mist or vapour?
Hyl. I must own, Philonous, those colours are not really in the clouds
as they seem to be at this distance. They are only apparent colours.
Phil. Apparent call you them? how shall we distinguish these
apparent colours from real?
Hyl. Very easily. Those are to be thought apparent which, appearing
only at a distance, vanish upon a nearer approach.
Phil. And those, I suppose, are to be thought real which are discovered
by the most near and exact survey.
Hyl. Right.
Phil. Is the nearest and exactest survey made by the help of a microscope,
or by the naked eye?
Hyl. By a microscope, doubtless.
Phil. But a microscope often discovers colours in an object different
from those perceived by the unassisted sight. And, in case we had microscopes
magnifying to any assigned degree, it is certain that no object whatsoever,
viewed through them, would appear in the same colour which it exhibits to the
naked eye.
Hyl. And what will you conclude from all this? You cannot argue that
there are really and naturally no colours on objects: because by artificial
managements they may be altered, or made to vanish.
Phil. I think it may evidently be concluded from your own concessions,
that all the colours we see with our naked eyes are only apparent as those on
the clouds, since they vanish upon a more close and accurate inspection which
is afforded us by a microscope. Then' as to what you say by way of prevention:
{185} I ask you whether the real and natural state of an object is better discovered
by a very sharp and piercing sight, or by one which is less sharp?
Hyl. By the former without doubt.
Phil. Is it not plain from Dioptrics that microscopes make the
sight more penetrating, and represent objects as they would appear to the eye
in case it were naturally endowed with a most exquisite sharpness?
Hyl. It is.
Phil. Consequently the microscopical representation is to be thought
that which best sets forth the real nature of the thing, or what it is in itself.
The colours, therefore, by it perceived are more genuine and real than those
perceived otherwise.
Hyl. I confess there is something in what you say.
Phil. Besides, it is not only possible but manifest, that there actually
are animals whose eyes are by nature framed to perceive those things which by
reason of their minuteness escape our sight. What think you of those inconceivably
small animals perceived by glasses? must we suppose they are all stark blind?
Or, in case they see, can it be imagined their sight hath not the same use in
preserving their bodies from injuries, which appears in that of all other animals?
And if it hath, is it not evident they must see particles less than their own
bodies; which will present them with a far different view in each object from
that which strikes our senses? Even our own eyes do not always represent objects
to us after the same manner. In the jaundice every one knows that all things
seem yellow. Is it not therefore highly probable those animals in whose eyes
we discern a very different texture from that of ours, and whose bodies abound
with different humours, do not see the same colours in every object that we
do? From all which, should it not seem to follow that all colours are equally
apparent, and that none of those which we perceive are really inherent in any
outward object?
Hyl. It should.
Phil. The point will be past all doubt, if you consider that, in case
colours were real properties or affections inherent in external bodies, they
could admit of no alteration without some change wrought in the very bodies
themselves: but, is it not evident from what hath been said that, upon the use
of microscopes, upon a change happening in the burnouts of the eye, or a variation
of distance, without any manner of real alteration {186} in the thing itself,
the colours of any object are either changed, or totally disappear? Nay, all
other circumstances remaining the same, change but the situation of some objects,
and they shall present different colours to the eye. The same thing happens
upon viewing an object in various degrees of light. And what is more known than
that the same bodies appear differently coloured by candle-light from what they
do in the open day? Add to these the experiment of a prism which, separating
the heterogeneous rays of light, alters the colour of any object, and will cause
the whitest to appear of a deep blue or red to the naked eye. And now tell me
whether you are still of opinion that every body hath its true real colour inhering
in it; and, if you think it hath, I would fain know farther from you, what certain
distance and position of the object, what peculiar texture and formation of
the eye, what degree or kind of light is necessary for ascertaining that true
colour, and distinguishing it from apparent ones.
Hyl. I own myself entirely satisfied, that they are all equally apparent,
and that there is no such thing as colour really inhering in external bodies,
but that it is altogether in the light. And what confirms me in this opinion
is, that in proportion to the light colours are still more or less vivid; and
if there be no light, then are there no colours perceived. Besides, allowing
there are colours on external objects, yet, how is it possible for us to perceive
them? For no external body affects the mind, unless it acts first on our organs
of sense. But the only action of bodies is motion; and motion cannot be communicated
otherwise than by impulse. A distant object therefore cannot act on the eye;
nor consequently make itself or its properties perceivable to the soul. Whence
it plainly follows that it is immediately some contiguous substance, which,
operating on the eye, occasions a perception of colours: and such is light.
Phil. Howl is light then a substance?
Hyl.. I tell you, Philonous, external light is nothing but a thin fluid
substance, whose minute particles being agitated with a brisk motion, and in
various manners reflected from the different surfaces of outward objects to
the eyes, communicate different motions to the optic nerves; which, being propagated
to the brain, cause therein various impressions; and these are attended with
the sensations of red, blue, yellow, &c.
Phil. It seems then the light doth no more than shake the optic nerves.
{187}
Hyl. Nothing else.
Phil. And consequent to each particular motion of the nerves, the mind
is affected with a sensation, which is some particular colour.
Hyl. Right.
Phil. And these sensations have no existence without the mind.
Hyl. They have not.
Phil. How then do you affirm that colours are in the light; since by
light you understand a corporeal substance external to the mind?
Hyl. Light and colours, as immediately perceived by us, I grant cannot
exist without the mind. But in themselves they are only the motions and configurations
of certain insensible particles of matter.
Phil. Colours then, in the vulgar sense, or taken for the immediate
objects of sight, cannot agree to any but a perceiving substance.
Hyl. That is what I say.
Phil. Well then, since you give up the point as to those sensible qualities
which are alone thought colours by all mankind beside, you may hold what you
please with regard to those invisible ones of the philosophers. It is not my
business to dispute about them; only I would advise you to bethink yourself,
whether, considering the inquiry we are upon, it be prudent for you to affirm
-- the red and blue which we see are not real colours, but certain
unknown motions and figures which no man ever did or can see are truly so.
Are not these shocking notions, and are not they subject to as many ridiculous
inferences, as those you were obliged to renounce before in the case of sounds?
Hyl. I frankly own, Philonous, that it is in vain to longer. Colours,
sounds, tastes, in a word all those termed secondary qualities, have
certainly no existence without the mind. But by this acknowledgment I must not
be supposed to derogate, the reality of Matter, or external objects; seeing
it is no more than several philosophers maintain, who nevertheless are the farthest
imaginable from denying Matter. For the clearer understanding of this, you must
know sensible qualities are by philosophers divided into Primary and
Secondary. The former are Extension, Figure, Solidity, Gravity, Motion,
and Rest; {188} and these they hold exist really in bodies. The latter are those
above enumerated; or, briefly, all sensible qualities beside the Primary;
which they assert are only so many sensations or ideas existing nowhere but
in the mind. But all this, I doubt not, you are apprised of. For my part, I
have been a long time sensible there was such an opinion current among philosophers,
but was never thoroughly convinced of its truth until now.
Phil. You are still then of opinion that extension and figures
are inherent in external unthinking substances?
Hyl. I am.
Phil. But what if the same arguments which are brought against Secondary
Qualities will hold good against these also?
Hyl. Why then I shall be obliged to think, they too exist only in the
mind.
Phil. Is it your opinion the very figure and extension which you perceive
by sense exist in the outward object or material substance?
Hyl. It is.
Phil. Have all other animals as good grounds to think the same of the
figure and extension which they see and feel?
Hyl. Without doubt, if they have any thought at all.
Phil. Answer me, Hylas. Think you the senses were bestowed upon all
animals for their preservation and well-being in life? or were they given to
men alone for this end?
Hyl. I make no question but they have the same use in all other animals.
Phil. If so, is it not necessary they should be enabled by them to
perceive their own limbs, and those bodies which are capable of harming them?
Hyl. Certainly.
Phil. A mite therefore must be supposed to see his own foot, and things
equal or even less than it, as bodies of some considerable dimension; though
at the same time they appear to you scarce discernible, or at best as so many
visible points?
Hyl. I cannot deny it.
Phil. And to creatures less than the mite they will seem yet larger?
Hyl. They will.
Phil. Insomuch that what you can hardly discern will to another extremely
minute animal appear as some huge mountain? {189}