Distinct from them are the pieces that depend for their consistency on repetition and cumulation.
In neither case was cumulation nor tolerance observed under the conditions of these experiments.
We have called one type of history evolution, the other cumulation; but how have these higher types been reached?
I conceive, then, that the cumulation of proof need go no further.
There is a sort of cumulation of consecutive phases, the later ones being impossible without the earlier.
