similar ideas; it is therefore great, not so much upon the principle of infinity, as upon that of vastness. But we are not so powerfully affected with any one impulse, unless it be one of a prodigious force indeed, as we are with a succession of similar impulses; because the nerves of the sensory do not (if I may use the expression) acquire a habit of repeating the same feeling in such a manner as to continue it longer than its cause is in action; besides, all the effects which I have attributed to expectation and surprise in Sect. ii. can have no place in a bare wall. SECTION XIV. LOCKE'S OPINION CONCERNING DARKNESS, CONSIDERED. IT is Mr. Locke's opinion, that darkness is not naturally an idea of terror; and that though an excessive light is painful to the sense, that the greatest excess of darkness is no ways troublesome. He observes indeed in another place, that a nurse or an old woman having once associated the ideas of ghosts and goblins with that of darkness, night ever after becomes painful and horrible to the imagination. The authority of this great man is doubtless as great as that of any man can be, and it seems to stand in the way of our general principle*. *Part ii. sect iii. We have considered darkness as a cause of the sublime; and we have all along considered the sublime as depending on some modification of pain or terror: so that, if darkness be no way painful or terrible to any, who have not had their minds early tainted with superstitions, it can be no source of the sublime to them. But, with all deference to such an authority, it seems to me, that an association of a more general nature, an association which takes in all mankind, may make darkness terrible; for, in utter darkness, it is impossible to know in what degree of safety we stand; we are ignorant of the objects that surround us; we may every moment strike against some dangerous obstruction; we may fall down a precipice the first step we take; and if an enemy approach, we know not in what quarter to defend ourselves; in such a case strength is no sure protection; wisdom can only act by guess; the boldest are staggered, and he who would pray for nothing else towards his defence is forced to pray for light. Ζευ πάτερ, αλλα συ ρυσαι υπ' Εν δε φαει και όλεσσον. As to the association of ghosts and goblins; ́surely it is more natural to think, that darkness, being originally an idea of terror, was chosen as a fit scene for such terrible representations, than that such representations have made darkness terrible. The mind of man very easily slides into an error of the former sort; but it is very hard to imagine, that the effect of an idea so universally terrible in all times, and in all countries, as darkness, could possibly have been owing to a set of idle 'stories, or to any cause of a nature so trivial, and of an operation so precarious. SECTION XV. DARKNESS TERRIBLE IN ITS OWN NATURE. PERHAPS it may appear on inquiry, that blackness and darkness are in some degree painful by their natural operation, independent of any associations whatsoever. I must observe, that the ideas of darkness and blackness are much the same; and they differ only in this, that blackness is a more confined idea. Mr. Cheselden has given us a very curious story of a boy, who had been born blind, and continued so until he was thirteen or fourteen years old; he was then couched for a cataract, by which operation he received his sight. Among many remarkable particulars that attended his first perceptions and judgments on visual objects, Cheselden tells us, that the first time the boy -saw a black object, it gave him great uneasi ness; and that some time after, upon accidentally seeing a negro woman, he was struck with great horror at the sight. The horror, in this case, can scarcely be supposed to arise from any association. The boy appears by the account to have been particularly observing and sensible for one of his age; and therefore it is probable, if the great uneasiness he felt at the first sight of black had arisen from its connexion with any other disagreeable ideas, he would have observed and mentioned it. For an idea, disagreeable only by association, has the cause of its ill effect on the passions evident enough at the first impression; in ordinary cases, it is indeed frequently lost; but this is because the original association was made very early, and the consequent impression repeated often. In our instance, there was no time for such a habit; and there is no reason to think that the ill effects of black on his imagination were more owing to its connexion with any disagreeable ideas, than that the good effects of more cheerful colours were derived from their connexion with pleasing ones. They had both probably their effects from their natural operation. SECTION XVI. WHY DARKNESS IS TERRIBLE. IT may be worth while to examine how darkness can operate in such a manner as to cause pain. It is observable, that still as we recede from the light, nature has so contrived it, that the pupil is enlarged by the retiring of the iris, in proportion to our recess. Now, instead of declining from it but a little, suppose that we withdraw entirely from the light; it is reasonable to think, that the contraction of the radial fibres of the iris is proportionably greater; and that this part may by great darkness come to be so contracted, as to strain the nerves that compose it beyond their natural tone; and by this means to produce a painful sensation. Such a tension it seems there certainly is, whilst we are involved in darkness; for in such a state, whilst the eye remains open, there is a continual nisus to receive light; this is manifest from the flashes and luminous appearances which often seem in these circumstances to play before it; and which can be nothing but the effect of spasms, produced by its own efforts in pursuit of its object; several other strong impulses will produce the idea of light in the eye, besides the substance of light itself, as we experience on many occasions. Some who allow darkness to be a cause of the sublime, would infer, from the dilatation of the pupil, that a relaxation may be productive of the sublime, as well as a 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 |