Contents: Evolution defined,Variety and unity in life,Life,its physical basis and simplest expression,Factors and mechanism of evolution,Natural selection and struggle for existence: sexual selection,Artificial selection,Various theories of species-forming and descent control,Geographic isolation and species-forming,Variation and mutation,Heredity,Inheritance of acquired characters,Generation,sex,and ontogeny,Factors in ontogeny and experimental development,Paleontology,Geographical distribution,Adaptations,Parasitism and degeneration,Mutual aid and communal life among animals,Color and pattern in animals,Reflexes,instinct,and reason,Man's place in nature.
