The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page v
... Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin- Principles of Selection , anciently followed , their Effects ...
... Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin- Principles of Selection , anciently followed , their Effects ...
Page vii
... DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification - Absence or rarity of ... difficulty - Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect - The ...
... DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification - Absence or rarity of ... difficulty - Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect - The ...
Page xiv
... difficulty of distinguishing species and varieties , by the almost perfect gradation of forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the ...
... difficulty of distinguishing species and varieties , by the almost perfect gradation of forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the ...
Page xix
... difficulty in ascertaining affini- ties ; second , of another impulse connected with the vital forces , tending , in the course of generations , to modify organic structures in accordance with external circumstances , as food , the ...
... difficulty in ascertaining affini- ties ; second , of another impulse connected with the vital forces , tending , in the course of generations , to modify organic structures in accordance with external circumstances , as food , the ...
Page xxiii
... difficulty of distinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also ...
... difficulty of distinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also ...
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Common terms and phrases
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 lamellę larvę 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