Every painter can tell us how each added line deflects his picture in a certain sense. Whatever lines follow must be built on those first laid down. Every author who starts to rewrite a piece of work knows how impossible it becomes to use any of the first-written pages again. The new beginning has already excluded the possibility of those earlier phrases and transitions, while it has at the same time created the possibility of an indefinite set of new ones, no one of which, however, is completely determined in advance. Just so the social surroundings of the past and present hour exclude the possibility of accepting certain contributions from individuals; but they do not positively define what contributions shall be accepted, for in themselves they are powerless to fix what the nature of the individual offerings shall be.[6] {232} Thus social evolution is a resultant of the interaction of two wholly distinct factors,--the individual, deriving his peculiar gifts from the play of physiological and infra-social forces, but bearing all the power of initiative and origination in his hands; and, second, the social environment, with its power of adopting or rejecting both him and his gifts. Both factors are essential to change. The community stagnates without the impulse of the individual. The impulse dies away without the sympathy of the community. All this seems nothing more than common-sense. All who wish to see it developed by a man of genius should read that golden little work, Bagehot's Physics and Politics, in which (it seems to me) the complete sense of the way in which concrete things grow and change is as livingly present as the straining after a pseudo-philosophy of evolution is livingly absent. But there are never wanting minds to whom such views seem personal and contracted, and allied to an anthropomorphism long exploded in other fields of knowledge. "The individual withers, and the world is more and more," to these writers; and in a Buckle, a Draper, and a Taine we all know how much the 'world' has come to be almost synonymous with the _climate_. We all know, too, how the controversy has been kept up between the partisans of a 'science of history' and those who deny the existence of anything like necessary 'laws' where human societies are concerned. Mr. Spencer, at the opening of his Study of Sociology, makes an onslaught on the 'great-man theory' of history, from which a few passages may be quoted:--