pedigree-diagrams

Updated: July 23, 2026

The conception of mutation periods producing swarms of species from time to time, among which only a few have a chance of survival, promises to become the basis for speculative pedigree-diagrams, as well as for experimental investigations. The principle of unit-characters and of elementary species leads at once to the recognition of two kinds of variability.

Hugo de Vries - Species and Varieties, Their Origin by Mutation