non-derivatives

Updated: May 13, 2025

Independent species are now and then springing up where derivatives should be looked for, while derivatives are everywhere disappearing in non-derivatives. Many of the middle Tertiary molusca, and a large proportion of the later Tertiary period, are specifically identical with the living species, of to-day. What has "natural selection" been doing for this family in the last million years or more?

Horatius Flaccus - Life: Its True Genesis