Charles Darwin's natural selection : being the second part of his big species book written from 1856 to 1858 / edited from the manuscript by R.C. Stauffer.

  • Darwin, Charles, 1809-1882.
Date:
[1975]
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Licence: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

Credit: Charles Darwin's natural selection : being the second part of his big species book written from 1856 to 1858 / edited from the manuscript by R.C. Stauffer. Source: Wellcome Collection.

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    Darwin's table of contents reasons for 92 Circumstances: antiquity &c, favourable to most variation, in Pigeons 94 Probable steps in the variation 96 Probable sports in Pigeons 103 Summary; varieties like species: man can not select internal changes, only conspicuous 107 Sum¬ mary that multiple origins not general; for breeds abnormal, & no reason why such selected & such extinct 109 Argument from peculiar races, when no peculiar endemic species 110 Argument from general fertility of mongrels 111 Antiquity of animals & plants 114 Summary on ditto 118 Summary on breeds resumed ; differ in variability 120 Objections, from assumed force nature 123 Especially plastic 124 Variation limited 126 Summary on objections & close of chapter CHAPTER III ON POSSIBILITY OF ALL ORGANISMS CROSSING: ON SUSCEPTIBILITY OF REPRODUCTION TO CHANGE 1 Ill-effects of interbreeding 3 Opposed facts: in islands 5 Good from crossing in plants 7 Even in hybrids 11 Good from slight changed conditions 13 Opposed facts 14 Good in animals 16 No land animal real hermaphrodite 18 Flowers are fertilised sub jove 19 Hermaphrodites & unisexual in same groups 20 All animals can cross. 26 All plants can cross 26 bis Dichogamy 27 Varieties of plants do cross freely 28 Great care taken by hybridisers to prevent crosses 31 On pollen carried by wind & insects 32 Insects necessary to fertilisation How bees find flowers 37 Bees frequent visits 39 Pollen brought to Thyme & Rhododendrons 41 Opposed facts to crossing of plants ; fertilisation in buds, Campanula &c 44 In wheat, varieties not crossing 46 Trees with separated sexes 47 bis Subularia, Podostemon 48 Goodenia 49 Aristolochia & Arum /3/ 50 Hollyocks 52 Orchi- daceae 56 Ophrys 58 Leguminosae 62 Opposed facts 64 Summary on probability of crossing occasional in animals & plants 66 Superfluity of pollen 68 Crossed offspring better chance of surviving 70 Final cause of crossing 72 Changes of condition causing lessened fertility 74 In animals 78 In birds 83 Effects on secondary male characters & instincts 84 Effects in domesti¬ cated animals : not explained by disease &c 86 In plants 89 Can stand great changes in temperature & domestic plants 90 Con- tabescence 93 Double flowers, great fruit & tubers 95 Parallelism in hybrids 97 Domestication & cultivation itself not stop fertility : Wild flowers not seeding in own country 100 Conclusion 101 Bears on variability & on early period of cause of. 26