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acquired action adaptation alleged allowed ancestral Animals and Plants ants appears artificial selection attributed become belief birds body bones breeds cause cent changes civilization concerned constitutional continually course Crown 8vo cumulative Darwin diminished diminution direct diseases duck easily effects of disuse elimination enlarged equally evidence evil evolution existence explanation eyes fact factor father favoured gemmules habits heredity human Illustrations important improvement increased independently individual inherited effects instances jaws kind least legs lengthened less Light lost means modifications mutilation natural selection needed nervous neuter offspring organs Origin parents period pigeons Plants under Domestication points powerful preserved probably produced Professor proof proportional prove rabbit race reduced relative says seems sexual shortened similar sole Species Spencer structure suppose teeth tend theory thickened tion transmission transmit true universal use-inheritance usually Variation of Animals varied various weak weight whole wild wing-bones wings
Página 26 - For peculiar habits confined to the workers or sterile females, however long they might be followed, could not possibly affect the males and fertile females, which alone leave descendants. I am surprised that no one has hitherto advanced this demonstrative case of neuter insects, against the well-known doctrine of inherited habit, as advanced by Lamarck.