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Updated: October 13, 2026
The most diverse questions and answers crop up; whether evolution has been brought about “monophyletically” or “polyphyletically,” i.e., through one or many genealogical trees; whether it has taken place in a continuous easy transition from one type to another, or by leaps and bounds; whether through a gradual transformation of all organs, each varying individually, or through correlated “kaleidoscopic” variations of many kinds throughout the whole system; whether it is essentially asymptotic, or whether organisms pass from “labile” phases of vital equilibrium by various halting-places to stable states, which are definitive, and are, so to speak, the blind alleys and terminal points of evolutionary possibilities, e.g., the extinct gigantic saurians, and perhaps also man.