On the Origin of Species by Means of Natural Selection: Or the Preservation of Favoured Races in the Struggle for Life |
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Page 7
... known fossiliferous strata , · 245 CHAPTER X. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS . On the slow and successive appearance of new species - On their different rates of change - Species once lost do not reappear - Groups of ...
... known fossiliferous strata , · 245 CHAPTER X. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS . On the slow and successive appearance of new species - On their different rates of change - Species once lost do not reappear - Groups of ...
Page 12
... known laws of variation and of correlation of growth . In the four succeeding chapters , the most apparent and gravest difficulties on the theory will be given : namely , first , the difficulties of transitions , or in understanding how ...
... known laws of variation and of correlation of growth . In the four succeeding chapters , the most apparent and gravest difficulties on the theory will be given : namely , first , the difficulties of transitions , or in understanding how ...
Page 20
... known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that when there is no apparent reason why a peculiarity should ...
... known to appear at the corresponding caterpillar or cocoon stage . But hereditary diseases and some other facts make me believe that the rule has a wider extension , and that when there is no apparent reason why a peculiarity should ...
Page 28
... known ; and these have not any of the characters of the domestic breeds . Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be un- known to ornithologists ...
... known ; and these have not any of the characters of the domestic breeds . Hence the supposed aboriginal stocks must either still exist in the countries where they were originally domesticated , and yet be un- known to ornithologists ...
Page 29
... - feathers , as any wild rock- pigeon . We can understand these facts , on the well- known principle of reversion to ancestral characters , if all the domestic breeds have descended from the rock - pigeon CHAP . I. ] 29 DOMESTIC PIGEONS.
... - feathers , as any wild rock- pigeon . We can understand these facts , on the well- known principle of reversion to ancestral characters , if all the domestic breeds have descended from the rock - pigeon CHAP . I. ] 29 DOMESTIC PIGEONS.
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accumulated adapted affinities allied species America amount ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species disuse divergence domestic doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ laws less living look male mammals manner migration modification modified descendants natural selection naturalists nearly nest offspring organic organisation perfect pigeons pistil plants pollen present probably produced progenitor ranked reciprocal crosses remarked resemble rudimentary seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation varieties vary whole widely