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able according actual adaptation advance already animals apes appearance become beginning birds body causes character characteristics closely common comparative complete connection continent Darwin definite derivation direct division doctrine of Descent effects embryonic entirely example exhibit existence explained external extremely facts families fish follows formation forms further genera given gradually groups higher human idea important individual infer islands knowledge known language latter less likewise limits linguistic living lower mammals manner means merely mind nature observations occur organisms origin perfect period phase phenomena placenta plants portion position possess possible present probably produced progress proved question races recent regard relations remains remarkable represented reproduction says selection separate sexual sexual reproduction shown shows side similar single species structure systematic theory tion transformation true varieties various vertebrate whole
Página 162 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.18 Darwin always knew that his views would be controversial. A few days before The Origin of Species appeared, Darwin wrote, in a letter to Wallace, 'God knows what...
Página 160 - Na'geli on plants, and the remarks by various authors with respect to animals, more especially those recently made by Professor Broca, that in the earlier editions of my Origin of Species I perhaps attributed too much to the action of natural selection or the survival of the fittest.