On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 99
... mammals and fish hardly come into competition with each other ; the advancement of the whole class of mammals , or of certain members in this class , to the highest grade would not lead to their taking the place of fishes ...
... mammals and fish hardly come into competition with each other ; the advancement of the whole class of mammals , or of certain members in this class , to the highest grade would not lead to their taking the place of fishes ...
Página 311
... mammals discovered by him in Attica serve to break down the intervals between existing genera . Cuvier ranked the Ruminants and and Pachyderms as two of the most distinct orders of mammals : but so many fossil links have been ...
... mammals discovered by him in Attica serve to break down the intervals between existing genera . Cuvier ranked the Ruminants and and Pachyderms as two of the most distinct orders of mammals : but so many fossil links have been ...
Página 363
... Mammals offer another and similar case . I have carefully searched the oldest voyages , and have not found a single instance , free from doubt , of a terrestrial mammal ( excluding domesticated animals kept by the natives ) inhabiting ...
... Mammals offer another and similar case . I have carefully searched the oldest voyages , and have not found a single instance , free from doubt , of a terrestrial mammal ( excluding domesticated animals kept by the natives ) inhabiting ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase 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 plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young