Great Books of the Western World: DarwinRobert Maynard Hutchins W. Benton, 1952 For contents, see Title Catalog. |
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Стр. 226
... developed , unless we have reason to suppose that they were formerly more highly developed , ought not to be considered as rudimentary . They may be in a nascent condition , and in progress towards further development . Rudi- mentary ...
... developed , unless we have reason to suppose that they were formerly more highly developed , ought not to be considered as rudimentary . They may be in a nascent condition , and in progress towards further development . Rudi- mentary ...
Стр. 375
... developed only at maturity or during old age . We see the same distinction more clearly with secondary sexual characters , for these are transmitted through both sexes , though developed in one alone . That they are present in both ...
... developed only at maturity or during old age . We see the same distinction more clearly with secondary sexual characters , for these are transmitted through both sexes , though developed in one alone . That they are present in both ...
Стр. 549
... developed than in the female . Male quadrupeds of many kinds differ from the females in having more hair , or hair of a different character , on certain parts of their faces . Thus the bull alone has curled hair on the forehead . 15 In ...
... developed than in the female . Male quadrupeds of many kinds differ from the females in having more hair , or hair of a different character , on certain parts of their faces . Thus the bull alone has curled hair on the forehead . 15 In ...
Содержание
THE ORIGIN OF SPECIES Page | 1 |
Causes of variability Effects of habit and the use or tures variable Parts developed in an unusual manner are highly variable specific characters more ... | 12 |
Variability Individual differences Doubtful species tion Cases of difficulty Natura non facit saltum Organs of small importance Organs not in all cases | 29 |
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adapted affinities America ancient appear beak become bees believe belonging birds breeds cause cells characters cies climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species doubt eggs embryo existing extinct extremely fact favourable female fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological geological period gradations greater number habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammæ mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occur offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds races ranked reciprocal crosses relation remarked resemblance rudimentary seeds sexual sexual selection slight South America stamens sterility structure supposed tend theory tion variability variations varieties vary whilst whole widely wings young