INDEX 



299 



Scotsman, 44. 



Scott, D. H., at the Oxford 

 centenary, 78. 



Scott, J., help given by Darwin 

 to, 53, 70 ; Dai-win to, 18-19, 

 53 n. 1, 70, 74. 



Scott, W. B., American Palaeon- 

 tology and, 2. 



Scudder, S. H., on N. American 

 butterflies, 152 n. 1, 165, 169 

 n. 1, 172, 176, 186, 188, 189- 

 90, 193. 



Scyllaea, a sea- weed-like mollusc, 

 107-8. 



sea-sickness, probably not 

 cause of Darwin's ill-health, 

 58 n. 2. 



season, ' eye-spots ' developed in 

 wet, 231-2. 



secondary and tertiary mimicry 

 in N. American butterflies, 

 182-3, 188, 190-1, 207. 



Sedgwick, A., Darwin taught by, 

 85 ; on Origin in review, 16 

 n. 4 ; and in letter to Darwin, 

 16, 18, 89. 



Seeley, H. G., on Archaeo- 

 pteryx, 30. 



segregation of varieties, 125. 



Semnopsyche, see ' Argynnis 

 diana '. 



Semon, R., on memory and here- 

 dity, 38. 



Seward, A. C., 4 . 1, 92. 



sex, mimicry and, 132-9, 182-3, 

 240. 



sexes, relative numbers of, in 

 butterflies, 233-5, 233 n. 1, 

 234 n. 4, 242. 



sexual selection, 139-43; Dai-win's 

 great interest in and descrip- 

 tion of, in joint essay, 103, 111, 

 113, 125-8, 139-40 ; the origin 

 of species and, 125; mimicry 

 and, 127-8, U8, 149 n. 1,238, 

 240 ; sounds and scents of in- 

 sects as evidence of, 141-2; 

 Darwin on, in letters to Tri- 

 men, 230-6, 242-4. 



Shakespeare, 62, 77, 80, 90. 



Shipley, A. E., on de Vries's 

 ' fluctuations ' non-transmis- 

 sible, 49 n. 1, 258-9, 265. 



shorthorn cattle, 249. 



Silurian, 47. 



' single centres of creation ', 

 Darwin and Lyell on, 248-9, 

 253. 



' Small Heath ' butterfly, value 

 of eye-spots of, 231-2. 



Smith, Geoffrey, 79. 



Solomon Islands, mimicry in, 

 160. 



Sound-producing organs as 

 evidence of sexual selection, 

 141. 



Species and Varieties; their 

 Origin by Mutation, de Vries, 

 49 n. 1, 259, 265-7. 



speciosa, Bonatea, 217, 228, 229, 

 229 n. 1. 



Spectator, 9 n. 1, 16 n. 4. 



Spencer, Herbert, 2 ; acquired 

 characters and the theories 

 of, 33-7. 



Sphex, as model, 114, 118. 



Spiders, as mimics, 116-17; mi- 

 metic males of, 133. 



spines and thorns, 98, 262 

 n. 3. 



St. Helena, 71. 



St. Jago, 6, 108. 



Stainton, T. H., 235. 



Strecker, 168, 211. 



Strelitzia reginae, fertilized by 

 sun-bird, 217, 228-9, 228 

 n.2. 



strigosa, f. of Danaida berenice, 

 154, 162-4, 171-2, 204-5. 



struggle for existence, the 

 essential feature of Dar- 

 winism, 8, 9; rate of evolu- 

 tion determined by, 46-7 ; 

 adaptation, natural selection 

 and, 94-101. 



sublime, feelings of the, 

 34-7. 



Sugar-bird, see ' sun-bird '. 



Sun-bird, Strelitzia fertilized by, 

 228-9, 228 n. 2. 



