True, but we are now dealing with biology, in which geometrical precision is inadmissible, where reality is defined not so much by the possession of certain characteristics as by its tendency to accentuate them. It is as a tendency that individuality is more particularly manifested; and if we look at it in this light, no one can deny that it does constitute one of the fundamental tendencies of life. Only the truth is that the tendency to individuality remains always and everywhere counterbalanced, and therefore limited, by an opposing tendency, the tendency to association, and above all to reproduction. This necessitates a correction in our analysis. Nature, in many respects, seems to take no interest in individuals. "Life appears to be a current passing from one germ to another through the medium of a developed organism." ("Creative Evolution", page 29.) It seems as if the organism played the part of a thoroughfare. What is important is rather the continuity of progress of which the individuals are only transitory phases. Between these phases again there are no sharp severances; each phase resolves and melts imperceptibly into that which follows. Is not the real problem of heredity to know how, and up to what point, a new individual breaks away from the individuals which produced it? Is not the real mystery of heredity the difference, not the resemblance, occurring between one term and another? Whatever be its solution, all the individual phases mutually extend and interpenetrate one another. There is a racial memory by which the past is continually accumulated and preserved. Life's history is embodied in its present. And that is really the ultimate reason of the perpetual novelty which surprised us just now. The characteristics of biological evolution are thus the same as those of human progress. Once again we find the very stuff of reality in duration. "We must not then speak any longer of life in general as an abstraction, or a mere heading under which we write down all living beings." ("Creative Evolution", page 28.) On the contrary, to it belongs the primordial function of reality. It is a very real current transmitted from generation to generation, organising and passing through bodies, without failing or becoming exhausted in any one of them. We may, already, then, draw one conclusion: Reality, at bottom, is becoming. But such a thesis runs counter to all our familiar ideas. It is imperative that we should submit it to the test of critical examination and positive verification.