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relaxation may be productive of the sublime, as well as convulsion but they do not I believe consider that although the circular ring of the iris be in some sense a sphincter, which may possibly be dilated by a simple relaxation, yet in one respect it differs from most of the other sphincters of the body, that it is furnished with antagonist muscles, which are the radial fibres of the iris: no sooner does the circular muscle begin to relax, than these fibres, wanting their counterpoise, are forcibly drawn back, and open the pupil to a considerable wideness. But though we were not apprized of this, I believe any one will find, if he opens his eyes and makes an effort to see in a dark place, that a very perceivable pain ensues. And I have heard some ladies remark, that after having worked a long time on a ground of black, their eyes were so pained and weakened, they could hardly see. It may perhaps be objected to this theory of the mechanical effect of darkness, that the ill effects of darkness or blackness seem rather mental than corporeal; and I own it is true, that they do so; and so do all those that depend on the affections of the finer parts of our system. The ill effects of bad weather appear often no otherwise, than in a melancholy and dejection of spirits; though without doubt, in this case, the bodily organs suffer first, and the mind through these organs.

SECTION XVII.

THE EFFECTS OF BLACKNESS.

Blackness is but a partial darkness; and therefore it derives some of its powers from being mixed and surrounded with colored bodies. In its own nature, it cannot be considered as a color. Black bodies, reflecting none, or but a few rays, with regard to sight, are but as so many vacant spaces dis persed among the objects we view. When the eye lights on one of these vacuities, after having been kept in some degree of tension by the play of the adjacent colors upon it, it suddenly falls into a relaxation; out of which it suddenly recov

ers by a convulsive spring. To illustrate this; let us consider, that when we intend to sit on a chair, and find it much lower than was expected, the shock is very violent; much more violent than could be thought from so slight a fall as the difference between one chair and another can possibly make. If, after descending a flight of stairs, we attempt inadvertently to take another step in the manner of the former ones, the shock is extremely rude and disagreeable; and by no art can we cause such a shock by the same means when we expect and prepare for it. When I say that this is owing to having the change made contrary to expectation; I do not mean solely, when the mind expects. I mean likewise, that when an organ of sense is for some time affected in some one manner, if it be suddenly affected otherwise, there ensues a convulsive motion; such a convulsion as is caused when any thing happens against the expectance of the mind. And though it may appear strange that such a change as produces a relaxation, should immediately produce a sudden convulsion; it is yet more certainly so, and so in all the senses. Every one knows that sleep is a relaxation; and that silence, where nothing keeps the organs of hearing in action, is in general fittest to bring on this relaxation; yet when a sort of murmuring sounds dispose a man to sleep, let these sounds cease suddenly, and the person immediately awakes; that is, the parts are braced up suddenly, and he awakes. This I have often experienced myself, and I have heard the same from observing persons. In like manner, if a person in broad day light were falling asleep, to introduce a sudden darkness would prevent his sleep for that time, though silence and darkness in themselves, and not suddenly introduced, are very favorable to it. This I knew only by conjecture on the analogy of the senses when I first digested these observations; but I have since experienced it. And I have often experienced, and so have a thousand others, that on the first inclining towards sleep, we have been suddenly awakened with a most violent start; and that this start was generally preceded by a sort of dream of our falling down a precipice:

whence does this strange motion arise, but from the too sudden relaxation of the body, which by some mechanism in nature restores itself by as quick and vigorous an exertion of the contracting power of the muscles! The dream itself is caused by this relaxation and it is of too uniform a nature to be attributed to any other cause. The parts relax too suddenly, which is in the nature of falling; and this accident of the body induces this image in the mind. When we are in a confirmed state of health and vigor, as all changes are then less sudden, and less on the extreme, we can seldom complain of this disagreeable sensation.

SECTION XVIII.

THE EFFECTS OF BLACKNESS MODERATED.

Though the effects of black be painful originally, we must not think they always continue so. Custom reconciles us to every thing. After we have been used to the sight of black objects, the terror abates, and the smoothness and glossiness or some agreeable accident of bodies so colored, softens in some measure the horror and sternness of their original nature; yet the nature of their original impression still continues. Black will always have something melancholy in it, because the sensory will always find the change to it from other colors too violent; or if it occupy the whole compass of the sight, it will then be darkness; and what was said of darkness will be applicable here. I do not purpose to go into all that might be said to illustrate this theory of the effects of light and darkness; neither will I examine all the different effects produced by the various modifications and mixtures of these two causes. If the foregoing observations have any foundation in nature, I conceive them very sufficient to account for all the phenomena that can arise from all the combinations of black with other colors. To enter into every particular, or to answer every objection, would be an endless labor. We have only followed the most leading roads;

and we shall observe the same conduct in our inquiry into the cause of beauty.

SECTION XIX.

THE PHYSICAL CAUSE OF LOVE.

When we have before us such objects as excite love and complacency; the body is affected, the body is affected, so far as I could observe, much in the following manner: the head reclines something on one side: the eye-lids are more closed than usual, and the eyes roll gently with an inclination to the object; the mouth is a little opened, and the breath drawn slowly, with now and then a low sigh; the whole body is composed, and the hands fall idly to the sides. All this is accompanied with an inward sense of melting and languor. These appearances are always proportioned to the degree of beauty in the object, and of sensibility in the observer. And this gradation from the highest pitch of beauty and sensibility even to the lowest of mediocrity and indifference, and their correspondent effects, ought to be kept in view, else this description will seem exaggerated, which it certainly is not. But from this description it is almost impossible not to conclude, that beauty acts by relaxing the solids of the whole system. There are all the appearances of such a relaxation; and a relaxation somewhat below the natural tone seems to me to be the cause of all positive pleasure. Who is a stranger to that manner of expression so common in all times and in all countries, of being softened, relaxed, enervated, dissolved, melted away by pleasure? The universal voice of mankind, faithful to their feelings, concurs in affirming this uniform and general effect: and although some odd and particular instance may perhaps be found, wherein there appears a considerable degree of positive pleasure, without all the characters of relaxation, we must not therefore reject the conclusion we had drawn from a concurrence of many experiments; but we still must retain it, subjoining the excep

tions which may occur according to the judicious rule laid down by Sir Isaac Newton in the third book of his Optics. Our position will, I conceive, appear confirmed beyond any reasonable doubt, if we can shew that such things as we have already observed to be the genuine constituents of beauty, have each of them, separately taken, a natural tendency to relax the fibres. And if it must be allowed us, that the appearance of the human body, when all these constituents are united together before the sensory, further favors this opinion, we may venture, I believe, to conclude, that the passion called love is produced by this relaxation. By the same method of reasoning which we have used in the inquiry into the causes of the sublime, we may likewise conclude, that as a beautiful object presented to the sense, by causing a relaxation of the body, produces the passion of love in the mind; so if by any means the passion should first have its origin in the mind, a relaxation of the outward organs will as certainly ensue in a degree proportioned to the cause.

SECTION XX.

WHY SMOOTHNESS IS BEAUTIFUL.

It is to explain the true cause of visual beauty that I call in the assistance of the other senses. If it appears that smoothness is a principal cause of pleasure to the touch, taste, smell, and hearing, it will be easily admitted a constituent of visual beauty; especially as we have before shewn, that this quality is found almost without exception in all bodies that are by general consent held beautiful. There can be no doubt that bodies which are rough and angular, rouse and vellicate the organs of feeling, causing a sense of pain, which consists in the violent tension or contraction of the muscular fibres. On the contrary, the application of smooth bodies relaxes; gentle stroking with a smooth hand allays violent pains and cramps, and relaxes the suffering parts from their

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