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 xiii
... trees . But he likewise believed in a law of progressive development ; and as all the forms of life thus tended to progress , in order to account for the existence at the pre- sent day of very simple productions , he maintained that ...
... trees . But he likewise believed in a law of progressive development ; and as all the forms of life thus tended to progress , in order to account for the existence at the pre- sent day of very simple productions , he maintained that ...
Page 3
... trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds that must be transported by certain birds , and which has flowers with separate sexes absolutely re- quiring the agency of certain ...
... trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds that must be transported by certain birds , and which has flowers with separate sexes absolutely re- quiring the agency of certain ...
Page 24
... trees . But besides C. livia , with its geographical sub - species , only two or three other species of rock - pigeons are known ; and these have not any of the characters of the domestic breeds . Hence the supposed aboriginal stocks ...
... trees . But besides C. livia , with its geographical sub - species , only two or three other species of rock - pigeons are known ; and these have not any of the characters of the domestic breeds . Hence the supposed aboriginal stocks ...
Page 30
... tree . Innumerable other examples could be given . The explanation , I think , is simple : from long - continued study they are strongly impressed with the differences between the several races ; and though they well know that each race ...
... tree . Innumerable other examples could be given . The explanation , I think , is simple : from long - continued study they are strongly impressed with the differences between the several races ; and though they well know that each race ...
Page 47
... nerves in Coccus , which may almost be compared to the irregular branch- ing of the stem of a tree . This philosophical naturalist , I may add , has also quite recently shown that CHAP . II , 47 VARIATION UNDER NATURE .
... nerves in Coccus , which may almost be compared to the irregular branch- ing of the stem of a tree . This philosophical naturalist , I may add , has also quite recently shown that CHAP . II , 47 VARIATION UNDER NATURE .
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accumulated adapted affinities allied species America amount analogous ancient animals appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo 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 hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ laws less living male mammals manner Marsupials migration modification modified descendants mongrels natural selection naturalists nearly nest occasionally offspring organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor racter ranked reciprocal crosses remarked resemble rudimentary organs seeds Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely