The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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Página xiv
... of natural selection shadowed forth , but how little Aristotle fully comprehended the principle , is shown by his remarks on the formation of the teeth . branches of trees . But he likewise believed in a. xiv HISTORICAL SKETCH .
... of natural selection shadowed forth , but how little Aristotle fully comprehended the principle , is shown by his remarks on the formation of the teeth . branches of trees . But he likewise believed in a. xiv HISTORICAL SKETCH .
Página xv
... trees . But he likewise believed in a law of progressive development ; and as all the forms of life thus tend to progress , in order to account for the ex- istence at the present day of simple productions , he maintains that such forms ...
... trees . But he likewise believed in a law of progressive development ; and as all the forms of life thus tend to progress , in order to account for the ex- istence at the present day of simple productions , he maintains that such forms ...
Página 3
... trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds that must be transported by certain birds , and. INTRODUCTION . 3.
... trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds that must be transported by certain birds , and. INTRODUCTION . 3.
Página 12
... tree under uniform conditions , has been known suddenly to assume a new character ; and as buds on distinct trees , growing under different con- ditions , have sometimes yielded nearly the same variety -for instance , buds on peach - trees ...
... tree under uniform conditions , has been known suddenly to assume a new character ; and as buds on distinct trees , growing under different con- ditions , have sometimes yielded nearly the same variety -for instance , buds on peach - trees ...
Página 26
... is , they did not breed or willingly perch on trees . But besides C. livia , with its geographical sub - species , only two or three other species of rock - pigeons are known ; and these. 26 [ CHAP . 1 . DOMESTIC PIGEONS .
... is , they did not breed or willingly perch on trees . But besides C. livia , with its geographical sub - species , only two or three other species of rock - pigeons are known ; and these. 26 [ CHAP . 1 . DOMESTIC PIGEONS .
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Términos y frases comunes
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young