Meanwhile, since we _must_ have formulæ and generalisations to think by, we are fain to accept our local views, and look on the world from this side or from that. Sometimes we are idealists, sometimes we are materialists; sometimes we believe in mechanics, sometimes in human or spiritual forces. The science of the last fifty years has, as pointed out in a preceding paper, looked at things more from the mechanical than the distinctively human side--from the point of view of the non-ego, rather than of the ego. Reacting from an extreme tendency towards a subjective view of phenomena, which characterised the older speculations, and fearing to be swayed by a kind of partiality towards himself, the modern scientist has endeavoured to remove the human and conscious element from his observations of Nature. And he has done valuable work in this way--but of course has been betrayed into a corresponding narrowness. In fact the main scientific doctrine of the day, Evolution, is obviously suffering from this treatment, and the following remarks are merely a few notes by way of suggestion of some things which may be said on its more specially human side. For since each man is a part of nature, and in that sense a part also of the evolution-process, his own subjective experience ought at least to throw some light on the conditions under which evolution takes place, and to contribute something towards an understanding of the problem. If the question is: What is the cause of Variation among animals? some approximation towards an answer ought to be got by each person asking himself, "Why do I vary?" Why--he might say--am I a different person from what I was ten years ago, or when I was a boy? Why have I varied in one direction and my brothers and sisters from the same nest in other directions? Though my individual consciousness only covers the small ground of my own life, and does not extend back to that of my father or forward to that of my son, still the intimate knowledge that I have of the forces acting on me during that short period may help me to an understanding of the forces that bring about the modification of men and animals at large, and the discovery of some laws of my own growth may reveal to me the laws of race-growth.