Whenever a branch or a twig is lacking on his genealogical trees, whenever the transit from one type to another would appear too abrupt, were we to restrict ourselves to creatures actually known, he invents species and groups bodily, to which he unhesitatingly assigns a place in phylogeny, often a part in phylogenesis.
"The Old Riddle and the Newest Answer"
John Gerard
We have concentrated the full force of our discussion upon an example drawn from phylogenesis.
"Creative Evolution"
Henri Bergson