The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page 45
... known that with pigeons many slight variations now occasionally appear , but these are rejected as faults or deviations from the standard of perfection in each breed . The common goose has not given rise to any marked varieties ; hence ...
... known that with pigeons many slight variations now occasionally appear , but these are rejected as faults or deviations from the standard of perfection in each breed . The common goose has not given rise to any marked varieties ; hence ...
Page 55
... known to every one , great differences of structure , in- dependently of variation , as in the two sexes of various animals , in the two or three castes of sterile females or workers amongst insects , and in the immature and larval ...
... known to every one , great differences of structure , in- dependently of variation , as in the two sexes of various animals , in the two or three castes of sterile females or workers amongst insects , and in the immature and larval ...
Page 57
... known varieties can be named which have not been ranked as species by at least some com- petent judges . That varieties of this doubtful nature are far from uncommon cannot be disputed . Compare the several floras of Great Britain , of ...
... known varieties can be named which have not been ranked as species by at least some com- petent judges . That varieties of this doubtful nature are far from uncommon cannot be disputed . Compare the several floras of Great Britain , of ...
Page 61
... it must be confessed that it is in the best known countries that we find the greatest number of them . I have been struck with the fact , that if any animal or plant in a state of nature be highly CHAP . II . ] 61 DOUBTFUL SPECIES .
... it must be confessed that it is in the best known countries that we find the greatest number of them . I have been struck with the fact , that if any animal or plant in a state of nature be highly CHAP . II . ] 61 DOUBTFUL SPECIES .
Page 63
... known , and its species were founded upon a few specimens , that is to say , were provisional . Just as we come to know them better , intermediate forms flow in , and doubts as to specific limits augment . " He also adds that it is the ...
... known , and its species were founded upon a few specimens , that is to say , were provisional . Just as we come to know them better , intermediate forms flow in , and doubts as to specific limits augment . " He also adds that it is the ...
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Common terms and phrases
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