The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
From inside the book
Results 1-5 of 100
Page x
... respect to young cuckoos ejecting their foster - brothers confirmed . On the cuckoo - like habits of the Molothrus . On fertile hybrid moths . The discussion on the fertility of hybrids not having been acquired through natural selection ...
... respect to young cuckoos ejecting their foster - brothers confirmed . On the cuckoo - like habits of the Molothrus . On fertile hybrid moths . The discussion on the fertility of hybrids not having been acquired through natural selection ...
Page xiv
... respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already existing forms , and much to use and disuse , that is , to the effects of ...
... respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already existing forms , and much to use and disuse , that is , to the effects of ...
Page xxv
... respect , expressed about the year 1859 ( see Prof. Rudolph Wagner , Zoologisch - Anthropologische Untersuchungen , ' 1861 , s . 51 ) his conviction , chiefly grounded on the laws of geographical distribution , that forms now perfectly ...
... respect , expressed about the year 1859 ( see Prof. Rudolph Wagner , Zoologisch - Anthropologische Untersuchungen , ' 1861 , s . 51 ) his conviction , chiefly grounded on the laws of geographical distribution , that forms now perfectly ...
Page 8
... respect to the direct action , we must bear in mind that in every case , as Professor Weis- mann has lately insisted , and as I have incidentally shown in my work on ' Variation under Domestication , ' there are two factors : namely ...
... respect to the direct action , we must bear in mind that in every case , as Professor Weis- mann has lately insisted , and as I have incidentally shown in my work on ' Variation under Domestication , ' there are two factors : namely ...
Page 10
... respect to what I have called the indirect ac- tion of changed conditions , namely , through the repro- ductive system being affected , we may infer that vari- ability is thus induced , partly from the fact of this system being ...
... respect to what I have called the indirect ac- tion of changed conditions , namely , through the repro- ductive system being affected , we may infer that vari- ability is thus induced , partly from the fact of this system being ...
Other editions - View all
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