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Updated: May 28, 2025
For those who do not cherish pedantic and sectarian prejudices, this hypothesis is changed into assurance by modern discoveries; it is shown in the transformations and transitions of paleontological forms; in the embryogenic evolution of so many animals, man included, which, according to their various species, reveals the lower types whence they issued; in the successive forms taken by the foetus; in the powerful and indisputable laws of selection; in the modifications by adaptation of the different organisms, and in the effects of isolation.
A priori is therefore reduced by us to the modification of organs in their physical and psychical constitution, as it has ultimately taken place in the organism by the successive evolutions of forms which have gradually become permanent, and are perpetuated by embryogenic reproduction.
Every moment, right before our eyes, nature arrives at identical results, in sometimes neighboring species, by entirely different embryogenic processes. Observations of "heteroblastia" have multiplied in late years, and it has been necessary to reject the almost classical theory of the specificity of embryonic gills.
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