The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356ÆäÀÌÁö |
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... not necessarily simultaneous - Diffi- culties of the theory of the Natural Selection of instincts - Neuter or sterile insects - Summary . 346 • ADDITIONS AND CORRECTIONS TO THE SIXTH EDITION NUMEROUS small corrections 6 CONTENTS.
... not necessarily simultaneous - Diffi- culties of the theory of the Natural Selection of instincts - Neuter or sterile insects - Summary . 346 • ADDITIONS AND CORRECTIONS TO THE SIXTH EDITION NUMEROUS small corrections 6 CONTENTS.
27 ÆäÀÌÁö
... insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds that must be transported by cer- tain birds , and which has flowers with separate sexes absolutely ...
... insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds that must be transported by cer- tain birds , and which has flowers with separate sexes absolutely ...
77 ÆäÀÌÁö
... insects are far from uniform . Authors sometimes argue in a circle when they state that important organs never vary ; for these same authors practically rank those parts as important ( as some few naturalists have honestly con- fessed ) ...
... insects are far from uniform . Authors sometimes argue in a circle when they state that important organs never vary ; for these same authors practically rank those parts as important ( as some few naturalists have honestly con- fessed ) ...
78 ÆäÀÌÁö
... insects , and in the immature and larval states of many of the lower animals . There are , also , cases of dimorphism and trimorphism , both with animals . and plants . Thus , Mr. Wallace , who has lately called at- tention to the ...
... insects , and in the immature and larval states of many of the lower animals . There are , also , cases of dimorphism and trimorphism , both with animals . and plants . Thus , Mr. Wallace , who has lately called at- tention to the ...
82 ÆäÀÌÁö
... insects which are charac- terized as varieties in Mr. Wollaston's admirable work , but which would certainly be ranked as distinct species by many entomologists . Even Ireland has a few animals , now generally regarded as varieties ...
... insects which are charac- terized as varieties in Mr. Wollaston's admirable work , but which would certainly be ranked as distinct species by many entomologists . Even Ireland has a few animals , now generally regarded as varieties ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young