The variation of animals and plants under domestication /

Abstract

Vol. II, p. 134: Inbreeding depression in plants expressed more strongly under competitive conditions than under optimal conditions. Lots of stuff about how hybrids are often fertile, intraspecific offspring sterile. The parallel between speciation and self-incompatibility, and heterostyly in plants. Inbreeding depression, and much Lamarckian beliefs about the efficacy of changed conditions of life to affect performance. The sterility of many domesticated wild animals, for example, put down to the changed conditions of life