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ALPHABETICAL LIST OF CHAPTER SUB-TITLES Minor varia are not included. Absence of Batrachians and Terrestrial Mammals on Oceanic Islands, 623. Acclimatisation, 286. Alternate Glacial Periods of the North and South, 591. Analogical Resemblances, 663. Breeds of the Domestic Pigeon, their Differences and Origin, 95. Cases of special difficulty on the Theory of Natural Selection, 349. Causes of the Sterility of first Crosses and of Hybrids, 443. Causes of Variability, 77. Cell-making instinct of the Hive-Bee, 40 2. Character of Domestic Varieties: difficulty of distinguishing between Varieties and Species; origin of Domestic Varieties from one or more Species , 88. Circumstances favourable to Man's Power of Selection, 114. Circumstances favourable to Natural Selection, 191. Classification, 646. Compensation and Economy of Growth, 295· Complex Relations of all Animals and Plants to each other in the Struggle for Existence, 154. Convergence of Character, 267. Correlated Variation, 290. Correlation of Growth, 290. Development and Embryology, 683. Dispersal during the Glacial period, 583. Distinct species present analogous variations ; and a variety of one species often assumes some of the characters of an allied species, or reverts to some of the characters of an early progenitor, 308. Divergence of Character,· 205. Doubtful Species, 126. Effects of Habit; Correlation of Growth; Inheritance, 83. Effects of Habit and of the Use or Disuse of Parts; Correlated Variation; Inheritance, 83. Effects of the increased Use and Disuse of Parts, as controlled by Natural Selection, 280. Effects of Use and Disuse, 280. Effects of Use and Disuse, as controlled by Natural Selection, 280. Embryology, 683. Embryology and Development, 683. Extinction, 203. Extinction caused by Natural Selection , 203. Fertility of Varieties when crossed, and of the Mongrel offspring, 459. Fresh-water Productions, 611. Geometrical Ratio of Increase, 147. Hybrids and Mongrels compared, independently of their fertility, 466. Illustrations of the action of Natural Selection, 176. Illustrations .... Selection, or the Survival of the Fittest, 176. Inherited Changes of Habit or Instinct in Domesticated Animals, 386. Instincts of the Cuckoo, 390. Laws governing the Sterility of first Crosses and of Hybrids, 435. Many of the Species included within the Larger Genera resemble Varieties in being very closely, but unequally , related to each other, and in having restricted ranges, 140. Means of Dispersal, 573Modes of Transition, 344. 797 Organs of extreme perfection and complication , 337. Organs of little apparent importance, 362. Organs of little apparent Importance, as affected by Natural Selection, 362. Origin and Causes of the Sterility of first Crosses and of Hybrids, 443. Reciprocal Dimorphism and Trimorphism , 453. Rudimentary, atrophied or aborted organs , 705. A part developed in any species in an extraordinary degree or manner, in comparison with the same part in allied species, tends to be highly variable, 2g8. Principles of Selection anciently followed , and their Effects, 104. The Probable Action of Natural Selection , through Divergence of Character and Extinction, on the Descendants of a Common Ancestor, 210. The Probable Results of the Action of Natural. ... Ancestor, 210. The Probable Effects. . . . Ancestor, 210. Secondary Sexual Characters Variable, 3°5· Selection, 104. Sexual Selection, 173. Slave-making instinct, 397. Special Difficulties of the Theory of Natural Selection, 349. Special Instincts, 389. Species of the Larger Genera in each Country vary more frequently than the Species of the Smaller Genera, 138. Specific Characters more Variable than Generic Characters, 303. Struggle for Life most severe between Individuals and Varieties of the same Species, 159. Summary of Chapter IV, 270. Summary to Chapter V, 317. Summary of Chapter VI, 375. Summary of Chapter VI: the Law of Unity of Type and of the Conditions of Existence embraced by the Theory of Natural Selection, 375. Summary of Chapter VIII, 470. 7g8 Nature of the Checks to Increase, 150. Morphology, 676. Multiple, Rudimentary, and Lowly-organised Structures are Variable, 297. Mundane Glacial Period, 591. Objections to the Theory of Natural Selection as applied to Instincts: Neu tel' and Sterile Insects, 412. On Extinction, 52 7. On the Absence of Numerous Intermediate Varieties in anyone Single Formation, 495. On the absence or rarity of transitional varieties, 322. On the Affinities of extinct Species to each other, and to living forms, 538. On the Breeds of the Domestic Pigeon, 95· On the Degree to which Organisation tends to advance, 220. On the Forms of Life changing almost simultaneously through the World, 532. On the Inhabitants of Oceanic Islands, 617. On the Intercrossing of Individuals, 185. On the lapse of Time, 478. On the Lapse of Time, as inferred from the rate of Deposition and extent...

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