phylogeny

It is expressed by the formula of Herbert Spencer, "Ontogeny recapitulates phylogeny."

These problems may be divided into two main groups, technically known as those of phylogeny and those of organogeny.

From the point of view of phylogeny, the animal kingdom is, therefore, clearly much younger than the plant kingdom.

The three most valuable sources of evidence in phylogeny are paleontology, comparative anatomy, and ontogeny.

Scientific and thorough proof of this will be found in the three volumes of my Systematic Phylogeny .