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 ii
... THEORY OF DESCENT AND DARWINISM . By Prof. OSCAR SCHMIDT , University of Strasburg . 12mo . Cloth . Price , $ 1.50 . DARWINIANA : ESSAYS AND REVIEWS PERTAINING TO DARWIN- ISM . By Prof. ASA GRAY . 1 vol . , 12mo . Cloth . Price , $ 2.00 ...
... THEORY OF DESCENT AND DARWINISM . By Prof. OSCAR SCHMIDT , University of Strasburg . 12mo . Cloth . Price , $ 1.50 . DARWINIANA : ESSAYS AND REVIEWS PERTAINING TO DARWIN- ISM . By Prof. ASA GRAY . 1 vol . , 12mo . Cloth . Price , $ 2.00 ...
Page vi
... THEORY . Difficulties of the theory of descent with modification ― - - Absence or rarity of transitional varieties - Transitions in habits of life Diversified habits in the same species - Species with habits widely different from those ...
... THEORY . Difficulties of the theory of descent with modification ― - - Absence or rarity of transitional varieties - Transitions in habits of life Diversified habits in the same species - Species with habits widely different from those ...
Page vii
... theory of the Natural Selection of instincts - Neuter or sterile insects Summary 205-234 - CHAPTER IX . HYBRIDISM . - Distinction between the sterility of first crosses and of hybrids - Sterility various in degree , not universal ...
... theory of the Natural Selection of instincts - Neuter or sterile insects Summary 205-234 - CHAPTER IX . HYBRIDISM . - Distinction between the sterility of first crosses and of hybrids - Sterility various in degree , not universal ...
Page ix
... theory of Natural Selection — Recapitulation of the general and special circumstances in its favour Causes of the general belief in the immutability of species How far the theory of Natural Selection may be extended Effects of its ...
... theory of Natural Selection — Recapitulation of the general and special circumstances in its favour Causes of the general belief in the immutability of species How far the theory of Natural Selection may be extended Effects of its ...
Page xviii
... theory of natural selection before I had done so ; and I expressed my surprise and satisfaction at this announcement ; but as far as it is possible to understand certain recently published passages ( Ibid . vol . iii . p . 798 ) , I ...
... theory of natural selection before I had done so ; and I expressed my surprise and satisfaction at this announcement ; but as far as it is possible to understand certain recently published passages ( Ibid . vol . iii . p . 798 ) , I ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly 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 lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young