double-races

Updated: May 25, 2025

Half-races and double-races are to be distinguished and isolated in all cases, and their hereditary qualities, the periodicity of the recurrence of the anomaly, the dependency on external circumstances and many other questions have to be answered.

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

This difference often indicates what can be expected from further culture. Stray tricotyls point to poor species or half-races, while more frequent deviations suggest rich or double-races. In both cases however, the trial must be made, and this requires the isolation of the aberrant individuals and the determination of their hereditary percentage.

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