The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 10
... period of growth , will determine whether or not a plant will produce seeds . I cannot here give the details which I have collected and elsewhere published on this curious subject ; but to show how singular the laws are which determine ...
... period of growth , will determine whether or not a plant will produce seeds . I cannot here give the details which I have collected and elsewhere published on this curious subject ; but to show how singular the laws are which determine ...
Página 20
... period than has hitherto been supposed . The lake - inhabitants of Switzerland cultivated several kinds of wheat and barley , the pea , the poppy for oil , and flax ; and they possessed several domesticated animals . They also carried ...
... period than has hitherto been supposed . The lake - inhabitants of Switzerland cultivated several kinds of wheat and barley , the pea , the poppy for oil , and flax ; and they possessed several domesticated animals . They also carried ...
Página 21
... period ; and we know that at the pres- ent day there is hardly a tribe so barbarous , as not to have domesticated at least the dog . The origin of most of our domestic animals will probably for ever remain vague . But I may here state ...
... period ; and we know that at the pres- ent day there is hardly a tribe so barbarous , as not to have domesticated at least the dog . The origin of most of our domestic animals will probably for ever remain vague . But I may here state ...
Página 38
... periods of English history choice animals were often imported , and laws were passed to prevent their ex- portation ... period attended to . Savages now sometimes cross their dogs with wild canine animals , to improve the breed , and ...
... periods of English history choice animals were often imported , and laws were passed to prevent their ex- portation ... period attended to . Savages now sometimes cross their dogs with wild canine animals , to improve the breed , and ...
Página 80
... period of from 740 to 750 years there would be nearly nineteen million elephants alive , descended from the first pair . But we have better evidence on this subject than mere theoretical calculations , namely , the numerous recorded ...
... period of from 740 to 750 years there would be nearly nineteen million elephants alive , descended from the first pair . But we have better evidence on this subject than mere theoretical calculations , namely , the numerous recorded ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray 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 effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young