INDEX. 



Accidental variations, i, 83. 



Acquired variations, 33. 



Acracids, 19. 



Acraea, 52. 



Active selection, 38. 



Adaptations, i, 10, 22, 61, 82. 



Adaptiveness, 66 footnote, 67, 74 et 



seq. 



Ageronia, 19. 

 Anaea, 22. 

 Anlagen, 35, 47, 53. 

 Arthropoda, 32, 62. 

 Articulata, 30. 

 Artificial selection, 33. 

 Askenasy, 24, 60, 82. 

 Atoms, 57, 58. 



Bar, K. E. von, 73. 



Bateson, 18, 73, 80. 



" Better " individuals, 76. 



Biology, character of research in, 7. 



Biophores, 40, 47, 58. 



Boltzmann, 4, 5. 



Bonnet, 53. 



Bourne, footnote, 54. 



Briicke, 40. 



Butterflies, 14 et seq., 18 et seq., 81. 



Catonephele, 50. 



Chance, 61. 



Chemical selection, 71. 



Chitons, 28. 



Coadaptation, 30. 



Colorings, protective, 14 et seq. 



Constancy of species, 46. 



Constructs, 8. 



Cormi, 66 footnote. 



Correlation, 21. 



Danaids, 19. 



Darwin, n, 25, 29, 36, 38, 66, 81, 83. 

 Definite variation, 3, 4, 60, 76-79, 82. 

 Degeneration, 30 et seq., 39 et seq. 



55, 63, 64, 79. 

 Delage, Yves, 40, 69. 

 Determinants, 6 et seq., 10, 36 et seq 



42, 54, 58. 



Developmental mechanics, 8, 9. 

 De Vries, 40. 

 Dimorphism, 58. 

 Directions of variations, 83. 

 Directive forces, 23, 24. 

 Dixey, 51 footnote. 

 Dohrn, 81. 

 Driesch, Hans, 12. 

 Dyer, Thiselton, 78-79. 



Eimer, 16, 70. 



Emery, 71, 83-84. 



Empedocles, 75. 



Epigenesis, 53 footnote, 58, 59. 



Euploids, 19. 



Europeans, exempt from malarial 



fevers, 82. 

 Eurypheme, 22. 

 Evolution, 53 footnote, 59. 



Fireworks, determinants and ids 



compared to, 7. 

 "Fits," 6 footnote. 

 Fluctuations of development, 74-75. 

 Formative laws, 17 et seq., 23. 

 Frog, 14. 



Functional adaptation, 29. 

 Functionless parts, 64. 



Galton, 36. 



Germs, 7 et seq., 40 et seq. 



