later in development; or, negatively, what is not the effect of human volition. But I have never seen any ground for assuming broadly that Nature abhors the exceptional, or prefers the earlier in time to the later; and when we take a retrospective view of the history of the human race, we find that some impulses which all admire, such as the love of knowledge and enthusiastic philanthropy, are both rarer and later in their appearance than others which all judge to be lower. Again, it is obviously unwarrantable to eschew as unnatural and opposed to the Divine design all such impulses as have been produced in us by the institutions of society, or our use of human arrangements and contrivances, or that result in any way from the deliberate action of our fellow-men: for this were arbitrarily to exclude society and human action from the scope of Nature’s purposes. And besides it is clear that many impulses so generated appear to be either moral or auxiliary to morality and in other ways beneficial: and though others no doubt are pernicious and misleading, it seems that we can only distinguish these latter from the former by taking note of their effects, and not by any precision that reflection can give to the notion of ‘natural.’ If, again, we fall back upon a more physical view of our nature and endeavour to ascertain for what end our corporeal frame was constructed, we find that such contemplation determines very little. We can infer from our nutritive system that we are intended to take food, and similarly that we are to exercise our various muscles in some way or other, and our brain and organs of sense. But this carries us a very trifling way, for the practical question almost always is, not whether we are to use our organs or leave them unused, but to what extent or in what manner we are to use them: and it does not appear that a definite answer to this question can ever be elicited, by a logical process of inference, from observations of the human organism, and the actual physical life of men. If, finally, we consider man in his social relations--as father, son, neighbour, citizen--and endeavour to determine the “natural” rights and obligations that attach to such relations, we find that the conception ‘natural’ presents a problem and not a solution. To an unreflective mind what is customary in social relations usually appears natural; but no reflective person is prepared to lay down “conformity to custom” as a fundamental moral principle: the problem, then, is to find in the rights and obligations established by custom in a particular society at a particular time an element that has a binding force beyond what mere custom can give. And this problem can only be solved by reference to the ultimate good of social existence--whether conceived as happiness or as perfection--or by appealing to some intuitively known principle of social duty, other than the principle of aiming at the happiness or perfection of society.