about the functions of the brain, but we can perceive that, as the intellectual powers become highly developed, the various parts of the brain must be connected by very intricate channels of the freest intercommunication; and as a consequence, each separate part would perhaps tend to be less well fitted to answer to particular sensations or associations in a definite and inherited—that is, instinctive—manner. There seems even to exist some relation between a low degree of intelligence and a strong tendency to the formation of fixed, though not inherited habits; for, as a sagacious physician remarked to me, persons who are slightly imbecile tend to act in everything by routine or habit; and they are rendered much happier if this is encouraged."[10] Darwin thinks instinctive action and action from habit may not be connected with either pleasure or pain, though he would seem to contradict this view in the latter part of the passage just quoted, and again where he says: "Although a habit may be blindly and implicitly followed, independently of any pleasure or pain felt at the moment, yet if it be forcibly and abruptly checked, a vague sense of dissatisfaction is generally experienced."[11]

In writing of the social instinct, Darwin begins with it as already existent, and seems, moreover, to maintain concerning it a theory of purpose elsewhere denied in his works and, indeed, antagonistic to the whole principle of the struggle for existence. He says: "It has often been assumed that animals were in the first place rendered social, and that they feel, as a consequence, uncomfortable when separated from each other, and comfortable whilst together; but it is a more probable view that these sensations were first developed, in order that those animals which would profit by living in society, should be induced to live together, in the same manner as the sense of hunger and the pleasure of eating were, no doubt, first acquired, in order to induce animals to eat."[12] If it were not for the expressions "should be induced" and "to induce," the words "in order that," taken in connection with what follows, might be interpreted as referring to mere sequence of time, as, on page 199, where Darwin refers to the "social faculties" simply as antecedent to society, they evidently do. For he says: "In order that primeval man, or the ape-like progenitors of man, should become social, they must have acquired the same instinctive feelings which induce other animals to live in a body." The sentences referred to which follow the first quotation are as follows: "The feeling of pleasure from society is probably an extension of the parental or filial affections, since the social instinct seems to be developed by the young remaining for a long time with their parents; and this extension may be attributed in part to habit, but chiefly to natural selection. With those animals which were benefited by living in close association, the individuals which took the greatest pleasure in society would best escape various dangers, whilst those that cared least for their comrades, and lived solitary, would perish in greater numbers. With respect to the origin of the parental and filial affections, which apparently lie at the base of the social instincts, we know not the steps by which they have been gained; but we may infer that it has been to a large extent through natural selection." The passage may possibly be consistently explained by the idea of the Survival of the Fittest, but it is at least very unclear in its wording. At the beginning of Chapter IV. of the same book, Darwin also gives a synopsis of the development of the moral sense from the social instincts, through the pleasure of association and service, remorse being a result of the power of representation, regard for the approbation and disapprobation of fellows arising from sympathy with them until resulting habit plays a very important part in guiding the conduct of the individual. Another passage, however, again introduces an antagonism between habit, instinct, and reason, and natural selection: "It is impossible to decide in many cases whether certain social instincts have been acquired through natural selection, or are the indirect result of other instincts and faculties, such as sympathy, reason, experience, and a tendency to imitation; or again, whether they are simply the result of long-continued habit." Darwin distinguishes between "the all-important emotion of sympathy," and that of love. "A mother may passionately love her sleeping and passive infant, but she can hardly at such times be said to feel sympathy for it"; but he includes both love and sympathy under the head of "sympathetic emotions"; and on page 163 he says: "With mankind, selfishness, experience, and imitation probably add, as Mr. Bain has shown, to the power of sympathy; for we are led by the hope of receiving good in return to perform acts of sympathetic kindness to others; and sympathy is much strengthened by habit." Again, on page 166, "instinctive love and sympathy" would seem to be contrasted with love and sympathy as habit, the increase of such feelings in the race through habit, elsewhere more or less distinctly asserted, being here ignored: "Although man, as he now exists, has few special instincts, having lost any which his early progenitors may have possessed, this is no reason why he should not have retained, from an extremely remote period, some degree of instinctive love and sympathy for his fellows. We are, indeed, all conscious that we do possess such sympathetic feelings; but our consciousness does not tell us whether they are instinctive, having originated long ago in the same manner as with the lower animals, or whether they have been acquired by each of us during our early years." But again, on page 220, sympathy is referred to as an element of the social instincts:[13] "It should, however, be borne in mind that the enforcement of public opinion depends on our appreciation of the approbation and disapprobation of others; and this appreciation is founded on our sympathy, which it can hardly be doubted was originally developed through natural selection as one of the most important elements of the social instincts"; though, on pages 167, 168, the social instinct is again contrasted with sympathy, since according to Darwin the desire for the approbation of others and the consequent yielding to their wishes is the result of sympathy: "Thus the social instincts, which must have been acquired by man in a very rude state, and probably even by his early ape-like progenitors, still give the impulse to some of his best actions; but his actions are in a higher degree determined by the expressed wishes and judgments of his fellow-men." Again the social and the maternal instincts and sympathy are identified and classed as under the dominion of the moral sense, pages 168-170: "It is evident, in the first place, that with mankind the instinctive impulses have different degrees of strength; a savage, will risk his own life to save that of a member of the same community, but will be wholly indifferent about a stranger; a young and timid mother urged by the maternal instinct will, without a moment's hesitation, run the greatest danger for her own infant, but not