The instincts we have hitherto noticed, and, I may say briefly, the instincts of animals generally, are destined to subserve two functions, (1) the preservation and, mainly, the nutrition, of the individual, and (2) the reproduction of the species. Armed with the facts we have now noticed, let us turn to consider instinct as it displays itself in ourselves. As one example, there is the instinct action by which an infant first sucks the nipple, and then swallows the thence-extracted nourishment with which its mouth is filled. This action must be reckoned as instinctive, because it is done directly after birth, when there has been no time for learning to perform the action; it is one absolutely necessary for the life of the infant; it is an action which is definite and precise, similarly performed by all the individuals of the species, though effected by a very complex mechanism, and is effected prior to experience. Yet it is not as mechanical as reflex action, for not only sensation, but consentience, accompanies the act. Thus sucking in man is an instinctive action, while spitting, on the other hand, is an art. The latter is not necessary to life, and the power of performing it is slowly acquired by experience, as are also our powers of walking and feeding ourselves. But the action of sucking in an adult human being is of course not instinctive; and because the child learns to walk, it by no means follows that the insect learns to fly. It is thus plain that actions may be instinctive in one animal and not in another; or at one period of life in the same animal and not at another. In a child, however, sucking, deglutition, inspiration, and expiration are instinctive actions, as are also those by which the products of excretion are removed from the body. The second class of instincts, those which ensure the continuance of the race, show themselves of course, only much later. Yet, long before the little girl can represent to herself future tributes to her charms, she seeks to decorate her tiny body with the arts of infant coquetry. Still less does she look forward to the pains and pleasures of maternity when she begins to caress and chastise, to soothe and cherish, her first doll, and fondly presses it to that region whence her future offspring will draw its nourishment. Again, when the lapse of a few years having made her a young woman and the boy a youth, they first feel the influence of love, however ignorant they may be of the physiology of their race, they will none the less, circumstances permitting, be surely impelled towards the performance of very definite actions. In the more refined individuals of the highest races of mankind, the material, merely animal, consummation of sexual love is most certainly far from being the one great end distinctly looked forward to by each pair of lovers. Yet every incident of affectionate intercourse, every tender glance, every contact of hand or lip, infallibly leads on towards the