On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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xv 페이지
... recently the great majority of naturalists believed that species were immutable productions , and had been separately created . This view has been ably maintained by many authors . Some few naturalists , on the other hand , have ...
... recently the great majority of naturalists believed that species were immutable productions , and had been separately created . This view has been ably maintained by many authors . Some few naturalists , on the other hand , have ...
xx 페이지
... recently published passages ( Ibid . vol . iii . p . 798 ) , I have either partially or wholly again fallen into error . It is consolatory to me that others find Professor Owen's controversial writings as difficult to understand and to ...
... recently published passages ( Ibid . vol . iii . p . 798 ) , I have either partially or wholly again fallen into error . It is consolatory to me that others find Professor Owen's controversial writings as difficult to understand and to ...
13 페이지
... recently communicated to me a good illustration of this fact ; on asking some farmers in Florida how it was that all their pigs were black , they informed him that the pigs ate the paint - root ( Lach- nanthes ) , which coloured their ...
... recently communicated to me a good illustration of this fact ; on asking some farmers in Florida how it was that all their pigs were black , they informed him that the pigs ate the paint - root ( Lach- nanthes ) , which coloured their ...
45 페이지
... recently in certain parts of Spain and of the United States this animal has been surprisingly modified and improved by careful selection : in peacocks , from not being very easily reared and a large stock not kept : in geese , from ...
... recently in certain parts of Spain and of the United States this animal has been surprisingly modified and improved by careful selection : in peacocks , from not being very easily reared and a large stock not kept : in geese , from ...
51 페이지
... recently Sir J. Lubbock has shown a degree of variability in these main nerves in Coccus , which may almost be compared to the irregular branching of the stem of a tree . This philosophical naturalist , I may add , has also recently ...
... recently Sir J. Lubbock has shown a degree of variability in these main nerves in Coccus , which may almost be compared to the irregular branching of the stem of a tree . This philosophical naturalist , I may add , has also recently ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely