The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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viii 페이지
... period — Alternate Glacial periods in the north and south 290 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the inhabitants of oceanic srand -Absence of Batrachians and of ...
... period — Alternate Glacial periods in the north and south 290 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the inhabitants of oceanic srand -Absence of Batrachians and of ...
xii 페이지
... species , as always maintained in this work . The belief in the separate creation of species generally held by naturalists , until a recent period . 1 AN HISTORICAL SKETCH OF THE PROGRESS OF OPINION ON THE xii ADDITIONS AND CORRECTIONS .
... species , as always maintained in this work . The belief in the separate creation of species generally held by naturalists , until a recent period . 1 AN HISTORICAL SKETCH OF THE PROGRESS OF OPINION ON THE xii ADDITIONS AND CORRECTIONS .
10 페이지
... period of life a peculiarity first appears , it tends to reappear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be otherwise ; thus the inherited pecu- liarities in the horns of cattle ...
... period of life a peculiarity first appears , it tends to reappear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be otherwise ; thus the inherited pecu- liarities in the horns of cattle ...
13 페이지
... 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 ...
23 페이지
... periods of English history choice animals were often imported , and laws were passed to prevent their exportation : the ... 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 exportation : the ... period attended to . Savages now sometimes cross their dogs with wild canine animals , to improve the breed , and ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely fact favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids 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 oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced 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