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 xxii
... principle of natural selection is con- cerned , it is quite immaterial whether or not Professor Owen preceded me , for both of us , as shown in this historical sketch , were long ago preceded by Dr. Wells and Mr. Matthews . M. Isidore ...
... principle of natural selection is con- cerned , it is quite immaterial whether or not Professor Owen preceded me , for both of us , as shown in this historical sketch , were long ago preceded by Dr. Wells and Mr. Matthews . M. Isidore ...
Página xxiii
... principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also treated Psychology on the principle of the necessary acquirement of each ...
... principle of general gradation , that species have been modified ; and he attributes the modification to the change of circumstances . The author ( 1855 ) has also treated Psychology on the principle of the necessary acquirement of each ...
Página 5
... principle of inheri- tance , any selected variety will tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural ...
... principle of inheri- tance , any selected variety will tend to propagate its new and modified form . This fundamental subject of Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural ...
Página 14
... his fundamental belief : doubts have been thrown on this principle only by theoretical writers . When any deviation of structure often appears , and we see it in the father and child , 14 VARIATION UNDER DOMESTICATION . [ CHAP . I.
... his fundamental belief : doubts have been thrown on this principle only by theoretical writers . When any deviation of structure often appears , and we see it in the father and child , 14 VARIATION UNDER DOMESTICATION . [ CHAP . I.
Página 29
... principle of reversion to ancestral characters , if all the domestic breeds are descended from the rock - pigeon . But if we deny this , we must make one of the two following highly improbable suppositions . Either , first , that all ...
... principle of reversion to ancestral characters , if all the domestic breeds are descended from the rock - pigeon . But if we deny this , we must make one of the two following highly improbable suppositions . Either , first , that all ...
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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