Recapitulation theory
Videos
The theory of recapitulation, also called the biogenetic law or embryological parallelism— usually summarized as "ontogeny recapitulates phylogeny"— is a historical hypothesis that the development of
George Romanes's 1892 copy of Ernst Haeckel's controversial embryo drawings
Drawing by Wilhelm His of chick brain compared to folded rubber tube, 1874. Ag (Anlage) = Optic lobes, matching bulges in rubber tube.
Darwin's finches by Gould