ration of climate is known to have happened during that period, it seems neces¬ sary to fall back upon 4 4 spontaneous ” variation (as one must in many other cases) ; that is to say, from causes which are at present beyond our vision, the fateful ape did, in fact, prefer animal food so decidedly as… … of Man, p. 609. of the Hominidce to have begun the differentiation If we suppose before the close about (say) 3,500,000 years are of the Oligocene, allowed for the evolution of the existing species of Man. All these reckonings are provisional.
