"I established the opposite view, that this history of the embryo (ontogeny) must be completed by a second, equally valuable, and closely connected branch of thought - the history of race (phylogeny). Both of these branches of evolutionary science, are, in my opinion, in the closest causal connection; this arises from the reciprocal action of the laws of heredity and adaptation... 'ontogenesis is a brief and rapid recapitulation of phylogenesis, determined by the physiological functions of heredity (generation) and adaptation (maintenance)."
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1899. Riddle of the Universe at the Close of the Nineteenth Century.
https://en.wikiquote.org/wiki/Ernst_Haeckel
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Ernst Haeckel
1834 – 1919
deutscher Zoologe und Philosoph
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