snuff, take it almost without being sensible that they take it, and the acute sense of smell is deadened, so as to feel hardly anything from so sharp a stimulus; yet deprive the snuff-taker of his box, and he is the most uneasy mortal in the world. Indeed so far are use and habit from being causes of pleasure merely as such, that the effect of constant use is to make all things of whatever kind entirely unaffecting. For as use at last takes off the painful effect of many things, it reduces the pleasurable effect in others in the same manner, and brings both to a sort of mediocrity and indifference. Very justly is use called a second nature; and our natural and common state is one of absolute indifference, equally prepared for pain or pleasure. But when we are thrown out of this state, or deprived of anything requisite to maintain us in it; when this chance does not happen by pleasure from some mechanical cause, we are always hurt. It is so with the second nature, custom, in all things which relate to it. Thus the want of the usual proportions in men and other animals is sure to disgust, though their presence is by no means any cause of real pleasure. It is true that the proportions laid down as causes of beauty in the human body, are frequently found in beautiful ones, because they are generally found in all mankind; but if it can be shown too that they are found without beauty, and that beauty frequently exists without them, and that this beauty, where it exists, always can be assigned to other less equivocal causes, it will naturally lead us to conclude that proportion and beauty are not ideas of the same nature. The true opposite to beauty is not disproportion or deformity, but _ugliness_: and as it proceeds from causes opposite to those of positive beauty, we cannot consider it until we come to treat of that. Between beauty and ugliness there is a sort of mediocrity, in which the assigned proportions are most commonly found; but this has no effect upon the passions. SECTION VI. FITNESS NOT THE CAUSE OF BEAUTY.