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 355
... fresh - water species , belonging to different classes , an enormous range , but allied species prevail in a remarkable manner throughout the world . When first collecting in the fresh waters of Brazil , I well remember feeling much ...
... fresh - water species , belonging to different classes , an enormous range , but allied species prevail in a remarkable manner throughout the world . When first collecting in the fresh waters of Brazil , I well remember feeling much ...
Página 356
... fresh - water fish often range widely , and as if capriciously ; for in two adjoining river - systems some of the species may be the same , and some wholly different . It is probable that they are occasionally transported by what may be ...
... fresh - water fish often range widely , and as if capriciously ; for in two adjoining river - systems some of the species may be the same , and some wholly different . It is probable that they are occasionally transported by what may be ...
Página 462
... fresh - water , distribution of , 355 . Fishes , ganoid , now confined to fresh water , 81 . electric organs of , 153 . ganoid , living in fresh water , 306 . of southern hemisphere , 349 . Flat - fish , their structure , 191 . Flight ...
... fresh - water , distribution of , 355 . Fishes , ganoid , now confined to fresh water , 81 . electric organs of , 153 . ganoid , living in fresh water , 306 . of southern hemisphere , 349 . Flat - fish , their structure , 191 . Flight ...
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