On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volume 2 |
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Page xii
... fossils beneath the Cam- brian system , corrected . Natural selection not the exclusive agency in the modi- fication of species , as always maintained in this work . The belief in the separate creation of species generally held by ...
... fossils beneath the Cam- brian system , corrected . Natural selection not the exclusive agency in the modi- fication of species , as always maintained in this work . The belief in the separate creation of species generally held by ...
Page xx
... Fossil Sloths , expressed , in 1821 , a similar belief . Similar views have , as is well known , been maintained by Oken in his mystical Natur - Philosophie . ' From other references in Godron's work ' Sur l'Espèce , ' it seems that ...
... Fossil Sloths , expressed , in 1821 , a similar belief . Similar views have , as is well known , been maintained by Oken in his mystical Natur - Philosophie . ' From other references in Godron's work ' Sur l'Espèce , ' it seems that ...
Page 42
... fossil land- shells in Madeira , and with plants by Gaston de Saporta . If a variety were to flourish so as to exceed in numbers the parent species , it would them rank as the species , and the species as the variety ; or it might come ...
... fossil land- shells in Madeira , and with plants by Gaston de Saporta . If a variety were to flourish so as to exceed in numbers the parent species , it would them rank as the species , and the species as the variety ; or it might come ...
Page 83
... fossils , connect to a certain extent orders at present widely sundered in the natural scale . These anomalous forms may be called living fossils ; they have endured to the present day , from having inhabited a confined area , and from ...
... fossils , connect to a certain extent orders at present widely sundered in the natural scale . These anomalous forms may be called living fossils ; they have endured to the present day , from having inhabited a confined area , and from ...
Page 104
... fossil state . As we here and there see a thin straggling branch springing from a fork low down in a tree , and which by some chance has been favoured and is still alive on its summit , so we occasionally see an animal like the ...
... fossil state . As we here and there see a thin straggling branch springing from a fork low down in a tree , and which by some chance has been favoured and is still alive on its summit , so we occasionally see an animal like the ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young