The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página 60
... important parts of structure , which he could collect on good authority , as I have collected , during a course of years . It should be remembered that systematists are far from being pleased at finding variability in important ...
... important parts of structure , which he could collect on good authority , as I have collected , during a course of years . It should be remembered that systematists are far from being pleased at finding variability in important ...
Página 417
... importance ! So again in formerly discussing certain morphological characters which are not functionally important , we have seen that they are often of the highest service in classification . This depends on their constancy throughout ...
... importance ! So again in formerly discussing certain morphological characters which are not functionally important , we have seen that they are often of the highest service in classification . This depends on their constancy throughout ...
Página 418
... importance for classification of the same important organ within the same group of beings . Again , no one will say that rudimentary or atrophied organs are of high physiological or vital importance ; yet , undoubtedly , organs in this ...
... importance for classification of the same important organ within the same group of beings . Again , no one will say that rudimentary or atrophied organs are of high physiological or vital importance ; yet , undoubtedly , organs in this ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear 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 eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological 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 male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young