unit-stride

Updated: May 19, 2025

Considering the mutative period of our evening-primrose as one unit-stride section in the great genealogic tree, this period includes two nearly related, but not identical changes. One is the production of new specific characters in the latent condition, and the other is the bringing of them to light and putting them into active existence.

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