ANIMAL ECOLOGY
XXIX.—THE STRUGGLE FOR EXISTENCE, ADAPTATION, AND SPECIES-FORMING.
The multiplication and crowding of animals, [404.]—The struggle for existence, [406.]—Variation and natural selection, [406.]—Adaptation and adjustment to surroundings, [407.]—Species forming, [408.]—Artificial selection, [409.]
XXX.—SOCIAL AND COMMUNAL LIFE, COMMENSALISM, AND PARASITISM.
Social life and gregariousness, [410.]—Communal life, [411.]—Commensalism, [413.]—Parasitism, [415.]
XXXI.—COLOR AND PROTECTIVE RESEMBLANCES.
Use of color, [424.]—General, variable, and special protective resemblance, [426.]—Warning colors, terrifying appearances, and mimicry, [430.]—Alluring coloration, [433.]
XXXII.—THE DISTRIBUTION OF ANIMALS.
Geographical distribution, [435.]—Laws of distribution, [437.]—Modes of migration and distribution, [437.]—Barriers to distribution, [438.]—Faunæ and zoogeographic areas, [440.]—Habitat and species, [441.]—Species-extinguishing and species-forming, [442.]