The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifePenguin Books, 1982 - 477 páginas |
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Página 110
... genus ) have been formed , many varieties or incipient species ought , as a general rule , to be now forming . Where many large trees grow , we expect to find saplings . Where many species of a genus have been formed through variation ...
... genus ) have been formed , many varieties or incipient species ought , as a general rule , to be now forming . Where many large trees grow , we expect to find saplings . Where many species of a genus have been formed through variation ...
Página 201
... genus . The ap- pearance of the stripes is not accompanied by any change of form or by any other new character . We see this tendency to become striped most strongly displayed in hybrids from between several of the most distinct species ...
... genus . The ap- pearance of the stripes is not accompanied by any change of form or by any other new character . We see this tendency to become striped most strongly displayed in hybrids from between several of the most distinct species ...
Página 405
... genus with the parent A ; or those from I , with the parent I. But the existing genus F11 may be supposed to have been but slightly modified ; and it will then rank with the parent - genus F ; just as some few still living organic ...
... genus with the parent A ; or those from I , with the parent I. But the existing genus F11 may be supposed to have been but slightly modified ; and it will then rank with the parent - genus F ; just as some few still living organic ...
Contenido
EDITORS INTRODUCTION | 11 |
NOTE ON THIS EDITION | 49 |
INTRODUCTION | 65 |
Derechos de autor | |
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Otras ediciones - Ver todas
The Origin of Species by Means of Natural Selection: Or the Preservation of ... Charles Darwin Vista previa limitada - 1982 |
The Origin of Species by Means of Natural Selection: Or, the Preservation of ... Charles Darwin Sin vista previa disponible - 2014 |
Términos y frases comunes
accumulated adapted affinities allied species America ancient animals appear become bees believe birds breeds cause cells chapter characters cirripedes climate closely allied colour continuous crossed crustaceans Darwin degree developed difficulty distinct species domestic doubt eggs embryo Europe existence exterminated extinct extremely facts favourable fertility flowers formation forms fossil genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvae less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest offspring organisation organs Origin Origin of Species palaeozoic perfect pigeons pistil plants pollen present principle probably produced progenitor quadrupeds ranked remarked reproductive resemblance rudimentary seeds seems sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion trees variability variations varieties vary whole widely wings