The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página xxi
... doubt the type - form , " & c . ( Ibid . vol . i . p . xxxv . ) , that Professor Owen admitted that natural selection may have done something in the formation of a new spe- cies ; but this it appears ( Ibid . vol . iii . p . 798 ) is in ...
... doubt the type - form , " & c . ( Ibid . vol . i . p . xxxv . ) , that Professor Owen admitted that natural selection may have done something in the formation of a new spe- cies ; but this it appears ( Ibid . vol . iii . p . 798 ) is in ...
Página xxv
... doubt- ful how far he extends his views on the modification of species . The Philosophy of Creation ' has been treated in a masterly manner by the Rev. Baden Powell , in his Essays on the Unity of Worlds , ' 1855. Nothing can be more ...
... doubt- ful how far he extends his views on the modification of species . The Philosophy of Creation ' has been treated in a masterly manner by the Rev. Baden Powell , in his Essays on the Unity of Worlds , ' 1855. Nothing can be more ...
Página 2
... doubt errors will have crept in , though I hope I have always been cautious in trusting to good authorities alone . I can here give only the general conclusions at which I have arrived , with a few facts in illustration , but which , I ...
... doubt errors will have crept in , though I hope I have always been cautious in trusting to good authorities alone . I can here give only the general conclusions at which I have arrived , with a few facts in illustration , but which , I ...
Página 6
... doubt , after the most deliberate study and dispassionate judgment of which I am capable , that the view which most naturalists until recently enter- tained , and which I formerly entertained - namely , that each species has been ...
... doubt , after the most deliberate study and dispassionate judgment of which I am capable , that the view which most naturalists until recently enter- tained , and which I formerly entertained - namely , that each species has been ...
Página 8
... same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt 8 VARIATION UNDER DOMESTICATION . [ CHAP . I.
... same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt 8 VARIATION UNDER DOMESTICATION . [ CHAP . I.
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young