On Germinal Selection as a Source of Definite Variation

August Weismann and Thomas Joseph McCormack

August Weismann pushed Darwin's idea inward, arguing that selection works among the tiny hereditary units inside the germ cells themselves. This lecture lays out his theory of germinal selection as the source of definite variation. A bold step toward modern genetics from a leading evolutionist. Follow the argument that took natural selection down to the germ.