Now I am not concerned to deny the value of this summary deduction for certain purposes. But it can easily be shown to be inadequate to afford a basis for a deductive method of seeking maximum happiness for the individual, by substituting Preservation for Pleasure as the end directly aimed at. In the first place, Mr. Spencer only affirms the conclusion to be true, as he rather vaguely says, “on the average”: and it is obvious that though the tendency to find injurious acts pleasant or preservative acts painful must be a disadvantage to any species of animal in the struggle for existence, it may--if existing only to a limited extent--be outweighed by other advantages, so that the organism in which it exists may survive in spite of it. This, I say, is obvious _a priori_: and common experience, as Mr. Spencer admits, shows “in many conspicuous ways” that this has been actually the case with civilised man during the whole period of history that we know: owing to the changes caused by the course of civilisation, “there has arisen and must long continue a deep and involved derangement of the natural connexions between pleasures and beneficial actions and between pains and detrimental actions.” This seems to be in itself a sufficient objection to founding a deductive method of Hedonism on Mr. Spencer’s general conclusion. It is, indeed, notorious that civilised men take pleasure in various forms of unhealthy conduct and find conformity to the rules of health irksome; and it is also important to note that they may be, and actually are, susceptible of keen pleasure from acts and processes that have no material tendency to preserve life. Nor is there any difficulty in explaining this on the “evolution hypothesis”; since we cannot argue _a priori_ from this hypothesis that the development of the nervous system in human beings may not bring with it intense susceptibilities to pleasure from non-preservative processes, if only the preservation of the individuals in whom such susceptibilities are developed is otherwise adequately provided for. Now this latter supposition is obviously realised in the case of persons of leisure in civilised society; whose needs of food, clothing, shelter, etc., are abundantly supplied through the complex social habit which we call the institution of private property: and I know no empirical ground for supposing that a cultivated man tends, in consequence of the keen and varied pleasure which he seeks and enjoys, to live longer than a man who goes through a comparatively dull round of monotonous routine activity, interspersed by slightly pleasurable intervals of repose and play.