Descent with modification

Definition and stakes

Portrait of August Weismann August Weismann,  Studies in the Theory of Descent…

“ If development has taken place, it must have occurred gradually and by minute steps—in such a manner indeed that each modification had time to become equilibrated to the other parts, and in this way a succession of modifications gradually brought about the total transformation of the organism, and at the same time secured complete adaptation to new conditions of life. ”
Source: Gutenberg

Portrait of Herbert Spencer Herbert Spencer,  The Development Hypothesis (1852)

“ Habitually looking at things rather in their statical than in their dynamical aspect, they never realize the fact that, by small increments of modification, any amount of modification may in time be generated. That surprise which they feel on finding one whom they last saw as a boy, grown into a man, becomes incredulity when the degree of change is greater. ”
Source: Wikisource

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