ADDITIONS AND CORRECTIONS TO THE ESSAYS AS ORIGINALLY PUBLISHED. Essays I. and II. are unaltered, but short notes are added at pp. 19, 24, 29, and 40. III.-Mimicry, and other Protective Resemblances among Animals. PAGE 53 Additional illustration of protective colouring in the case of the wood-dove and the robin. 63 On moths resembling bird's dung and mortar. 86 Correction of some names of African Papilios and a reference to Mr. Trimen's observations. 89 Mr. Jenner Weir's observation on birds which refused to eat Spilosoma menthrasti. 102 An additional case of snake mimicry in Oxyrhopus trigeminus. 107 Mr. Salvin's case of mimicry among hawks. 113 Name, Diadema anomala, added. 117 to 122. Use of gay colours in caterpillars, with an account of Mr. Jenner Weir's and Mr. Butler's observations. IV.— The Malayan Papilionida or Swallow-tailed Butterflies, as illustrative of the Theory of Natural Selection. 135 to 140. Additions to the discussion on the rank of the Papilionidæ, and on the principles which determine the comparative rank of groups in the animal kingdom. PAGE 164 Illustration of variability from Mr. Baker's re vision of the British Roses. 173 Additional facts, on local variations of colour. 196 Additional genus of birds (Ceycopsis) peculiar to Celebes. 199, 200. Concluding remarks. VI.—The Philosophy of Birds' Nests. 218 Un nesting of Terns and Gulls, rewritten. 220 to 222. Daines Barrington, and others, on the song of birds. 223 On young birds learning to build, by memory and imitation. 224 Levaillant, on mode of nest-building. 229 On imperfect adaptation in birds' nests.' VII.- A Theory of Birds' Nests. 231, 232. Introductory passages modified, with some omissions. 233 How modifications of organization would affect the form of the nest. 235 Illustration from the habits of children and savages. 235, 236. Objection to term “ hereditary habit” answered. 237 Passage rewritten, on more or less variable char acters in relation to nidification. 248 On males choosing or rejecting females, and on the various modes in which colour may be acquired by female birds. PAGE 249 On probable ancestral colours of female birds. 255 Protective colouring of the Waxwing. VIII.— Creation by Law. 293 Amount of variation in dogs. 296, 297. The “ Times” on Natural Selection. 298 to 300. On intermediate or generalized forms of extinct animals as an indication of transmuta tion or development. 302 Tabular demonstration of the Origin of Species by Natural Selection. IX.-The development of Human Races, under the law of Natural Selection. 316 On colour as perhaps correlated with immunity from disease in man. 326, 327. On the probable future development of man. 330 Concluding paragraph rewritten. London, March, 1870. CONTENTS. I.-On the Law which has regulated the introduction of New Geographical distribution dependent on Geologic Changes — A Law deduced from well-known Geographical and Geological facts, The form of a true system of Classification determined by this Law-Geo- graphical Distribution of Organisms-Geological Distribution of the II.-On the Tendency of Varieties to depart indefinitely from the Instability of Varieties supposed to prove the permanent distinctness of Species — The Struggle for Existence –The Law of Population of Species—The Abundance or Rarity of a Species dependent upon its more or less perfect Adaptation to the Conditions of Existence - Useful Variations will tend to Increase, useless or hurtful Variations to Diminish-Superior Varieties will ultimately extirpate the Ori- ginal Species — The Partial Reversion of Domesticated Varieties explained – Lamarck's Hypothesis very different from that now advanced-Conclusion . . . . . . . Pp. 26-44 Test of true and false Theories—Importance of the Principle of Utility - Popular Theories of Colour in Animals--Importance of Conceal- |