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
... land , and by occasional means - Dispersal during the Glacial period — Alternate Glacial periods in the north and south 290 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the ...
... land , and by occasional means - Dispersal during the Glacial period — Alternate Glacial periods in the north and south 290 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the ...
12 페이지
... land , much diversity in the breeds ; and that some of these ancient breeds closely resemble , or are even identical with , those still cxist- ing . But this only throws far backwards the history 12 CHARACTER OF DOMESTIC VARIETIES ...
... land , much diversity in the breeds ; and that some of these ancient breeds closely resemble , or are even identical with , those still cxist- ing . But this only throws far backwards the history 12 CHARACTER OF DOMESTIC VARIETIES ...
21 페이지
... land or mountain pasture , with the wool of one breed good for one purpose , and that of another breed for another purpose ; when we compare the many breeds of dogs , each good for man in different ways ; when we com pare the game ...
... land or mountain pasture , with the wool of one breed good for one purpose , and that of another breed for another purpose ; when we compare the many breeds of dogs , each good for man in different ways ; when we com pare the game ...
28 페이지
... land plays a part . Wandering savages or the inhabitants of open plains rarely possess more than one breed of the same species . Pigeons can be mated for life , and this is a great convenience to the fancier , for thus many races may be ...
... land plays a part . Wandering savages or the inhabitants of open plains rarely possess more than one breed of the same species . Pigeons can be mated for life , and this is a great convenience to the fancier , for thus many races may be ...
39 페이지
... land - shells in Madeira , and with plants by Gaston de Saporta . If a variety were to flourish so as to exceed in numbers the parent species , it would then rank as the species , and the species as the variety ; or it might come to ...
... land - shells in Madeira , and with plants by Gaston de Saporta . If a variety were to flourish so as to exceed in numbers the parent species , it would then rank as the species , and the species as the variety ; or it might come to ...
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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