Eventually, then, there will come also a state in which egoism and altruism are so conciliated that the one merges in the other."
Of course the foregoing prediction does not imply that human nature will ever undergo such physiological change as would be represented by structural specializations comparable to those by which the various castes of insect societies are differentiated. We are not bidden to imagine a future state of humanity in which the active majority would consist of semi-female workers and Amazons toiling for an inactive minority of selected Mothers. Even in his chapter, " Human Population in the Future," Mr. Spencer has attempted no detailed statement of the physical modifications inevitable to the production of higher moral types,—though his general statement in regard to a perfected nervous system, and a great diminution of human fertility, suggests that such moral evolution would signify a very considerable amount of physical change. If it be legitimate to believe in a future humanity to which the pleasure of mutual beneficence will represent the whole joy of life, would it not also be legitimate to imagine other transformations, physical