First Edition, Volume II., Page 23. Second Edition Volume I., Page 467. Dr. Brown-Sequard on the inherited effects of operations on the Guinea-pig. First Edition, Volume II., Page 24. Second Edition Volume I., Page 469. Other cases of inherited mutilations. First Edition, Volume II., Page 43. Second Edition Volume II., Page 17. An additional case of reversion due to a cross. First Edition, Volume II., Page 72. Second Edition Volume II., Page 48. Inheritance as limited by sex. First Edition, Volume II., Page 105. Second Edition Volume II., Page 83. Two varieties of maize which cannot be crossed. First Edition, Volume II., Page 120. Second Edition Volume II., Page 99. Some additional facts on the advantages of cross-breeding in animals. First Edition, Volume II., Page 123. Second Edition Volume II., Page 103. Discussion on the effects of close interbreeding in the case of man. First Edition, Volume II., Page 135 to 141. Second Edition Volume II., Page 117 to 122. Additional cases of plants sterile with pollen from the same plant. First Edition, Volume II., Page 149. Second Edition Volume II., Page 131. Mr. Sclater on the infertility of animals under confinement. First Edition, Volume II., Page 152. Second Edition Volume II., Page 134. The Aperea a distinct species from the Guinea-pig. First Edition, Volume II., Page 230. Second Edition Volume II., Page 215. Professor Jager on hawks killing light-coloured pigeons. First Edition, Volume II., Page 273. Second Edition Volume II., Page 262. Professor Weismann on the effects of isolation in the development of species. First Edition, Volume II., Page 281. Second Edition Volume II., Page 271. The direct action of the conditions of life in causing variation. First Edition, Volume II., Page 317. Second Edition Volume II., Page 309. Mr. Romanes on rudimentary parts. First Edition, Volume II., Page 324 to 328. Second Edition Volume II., Page 316 to 327. Some additional cases of correlated variability. First Edition, Volume II., Page 339. Second Edition Volume II., Page 333. On Geoffroy St.-Hilaire's law of "soi pour soi." First Edition, Volume II., Page 357 to 404. Second Edition Volume II., Page 349 to 399. The chapter on Pangenesis has been largely altered and re-modelled; but the essential principles remain the same. THE VARIATION OF ANIMALS AND PLANTS UNDER DOMESTICATION. INTRODUCTION.