5°° 



INDEX 



Self-interest, Preston on, ii. 52 



Self-sterility, in Eschscholtzia, ii. 352 ; 

 in plants, ii. 336, 347 ; connection 

 with unnatural conditions, ii. 351 



Selliera, Hamilton on fertilisation- 

 mechanism, ii. 351 



Semper, K., biographical note, i. 391 ; 

 letter to, i. 391-2 



Senecio, i. 47, 163 ; 6". vulgaris, profits 

 by cross-fertilisation, ii. 414 



Sensitive plants, Darwin's work on, 

 i. 417 ; ii, 289, 361 



Sensitiveness, diversified kinds in allied 

 plants, ii. 385 



Separate creations, i. 163, 173 ; Darwin 

 on, i. 377, 378 



Sequoia, i. 92 



Seringe, on Aconitum flowers, ii. 335 



Sertularia, i. 16 



Sethia, dimorphism of, ii. 351 



Settegast, H., letter to, i. 324 



Severn, Darwin on floods of, ii. 169 



Seward, A. C, Fossil Plants as Tests 

 of Climate, ii. 21 



Sexes, colour, and difference in. ii. 88 ; 

 proportion at birth, ii. 41 ; proportion 

 in animals, ii. 42, 67 



Sexual likeness, secondary, i. 351 



Sexual organs, as collectors of genera- 

 tive elements, i. 359 ; appendages in 

 insects complemental to, ii. 94 



Sexual reproduction. Galton on, i. 361 ; 

 bearing of F. Midler's work on 

 essence of, ii. 354 



Sexual Selection, i. 316 ; ii. 56-97 ; 

 Bates on, i. 182, 183 ; Darwin on, 

 i. 183, 303, 327 ; article in Kosmos 

 on, ii. 371 ; colour and, ii. 57-9 ; 

 68, 72-4, 86, 87, 96 ; man and, ii. 

 33> 35> 59 5 in moths and butterflies, 

 ii. 94 ; subordinate to Natural Selec- 

 tion, ii. 88 ; Wallace on colour and, 

 ii. 72-4 ; Wallace on difficulties of, 

 ii. 62, 93 



Sexuality, Bentham on, i. 349 ; in lower 

 forms, i. 360 ; origin of, i. 190 



Shanghai, tooth of Mastodon from, i. 

 211 



Sharp, David, on Bombus, i. 262; on 

 Vohicella, i. 196 ; Insects, ii. 12, 89 



Sharpe, Daniel, biographical note, ii. 

 131 ; on elevation, i. 90 ; Darwin 

 meets, ii. 131 ; letters to, ii. 199-204; 

 on cleavage and foliation, ii. 131, 199, 

 203, 204 



Sharpey, W., i. 88; letter from 

 Falconer to, i. 252-6 ; honorary 

 member of Physiological Society, 

 ii. 436 



Shaw, J., letter to, ii. 56 



Sheep, varieties of, i. 127 



Sheldrake, dancing on sand to make 

 sea-worms come out, ii. 103 



Shells, Forbes and Hancock on British, 

 i. 100 ; distorted by cleavage, ii. 204 ; 

 means of dispersal, ii. 28, 29 ; pro- 

 tective colour of, ii. 95 



Sherborn, C. D., Catalogue of Mam- 

 malia by A.'S. Woodward and, i. 206 



Shetland, comparison between flora of 

 T. del Fuego and that of, ii. 242 



Shrewsbury, i. 13, 28 ; school, i. 4 



Siberia, Rhinoceros and steppes of 

 central, i. 457 



Sicily, elephants of, i. 206 ; flora of, 



L Si 



Sidgwick, Prof. H., ii. 442 



Siebold, von, i. 75 



Sigittaria, an aquatic plant, ii. 217, 220 



Silene, Gartner's crossing-experiments 



on, i. 450 

 Silurian, comparison between recent 



organisms and, i. 115 ; life of, i. 142 ; 



Lingula from the, i. 164 ; corals, ii. 



194, 197 ; volcanic strata, ii. 136 

 Simon, Sir J., reports by, ii. 444 

 Simple forms, existence of, i. 151 ; 



survival of, i. 142 

 Simpson, Sir J., on regeneration in 



womb, i. 363 

 Siphocampylus, i. 221 ; ii. 310 

 Silaris, Lord Avebury on Meloe and, 



i. 232 ; ii. 12 

 Siwalik hills, i. 168 

 Skertchley, S. B. ]., on palaeolithic 



flints in boulder-clay of E. Anglia, 



ii. 241 ; letter to, ii. 240, 241 

 Skin, influence of mind on eruptions of, 



ii. 107 

 Slate, cleavage of schists and, ii. 203 

 Slave-ants, account in the Origin of, 



i. 197 

 Sleep, plants' so-called, ii. 362 

 Sleep-movements, in plants, ii. 363, 



364, 367. 397-9. 4ii; of cotyledons, 



ii. 414, 415 

 Slime of seeds, ii. 387 

 Sloths, i. 115 



Smell, Ogle's work on sense of, ii. 102 

 Smerinl/ius populi-ocellatus, Weir on 



hybrid, i. 396 

 Smilaceae, reference to genera of, i. 83 

 Smilax, De Candolle on flower of, i. 



369 

 Smith, Goldwin, i. 309 

 Smith, J., note on, ii. 410 

 Snails of Porto Santo, i. 446 

 Snipe, protective colour of, ii. 87 

 Snow, red, i. 24 ; geological action of 



frozen, ii. 169 



