348 



INDEX. 



Selection, constitutional, 330, 334; 

 experiment in, 331; by insects, 

 335 ; of the luckiest, 331 ; natural, 

 333. See Natural Selection. 



Self-fertilisation, and the flora of 

 Dovrefjeld, 259 ; cosmopolitan, 

 283 ; Mr. Darwin's views on, 215, 

 and review of, 315, seqq. ; and de- 

 generacy, 252 ; of Upilobium, (fig. 

 53) 255; general, 192, 199, 216; 

 and homomorphism, 214; illustra- 

 tions of, (tigs. 52-60) 255-262 ; 

 injuriousness of, disproved, 315, 

 seqq. ; misinterpretations regard- 

 ing, 312, seqq.; of Orchids, 253, 

 318; peculiarities of, 253; rapid 

 recovery of, 320; o{ Stellaria media, 

 (Hg. 52) 255 ; and whole colour- 

 ing, 183 



Sensitiveness, 151. See Protoplasm. 



Sepaline cords, source of staminal 

 and carpellary, 42, seqq. ; in Cam- 

 panula, (fi^. 8) 43, and (fig. 15) 

 71 ; Lahiatce increase of, in calyx 

 of, 56 ; Salvia, in calyx of, 55 



Sepals, arrest of, 8 ; carpellary lobes 

 of, in Pea, (fig. 70) 292 ; cords of, 

 in Campanula, (fig. 8) 43, (fig. 15) 

 71, and in Hollyhock, 44; de- 

 velopment of, order of, 191 seqq. ; 

 emergence of, 184, seqq., and iu 

 Cruciferce, 32 ; foliaceous, in Ra- 

 nunculus (fig. QQ), in Trifolium 

 (fig. 67), 289 ; homologous with 

 petioles, 288 ; lateral pair of, in 

 Crucifei-s, first to emerge, (fig. 6) 

 32, 185 ; nectaries superposed to, 

 in Hellebore, (fig. 5) 22 ; numbers 

 of, in whorls, 25, seqq. ; ovulife- 

 rous, in Violet, (fig. 71) 292 ; pe- 

 taloid, one abnormally in Linaria, 

 (fig. 69) 291, normally in Mus- 

 sceyida, (fig. Q9>) 290 ; petals super- 

 posed to, in Garidella, (fig. 4) 21 ; 

 pistiloid, 291 ; staminoid, 291 ; ve- 

 nation of, 289 



Septa, absorption of, in liber and 

 wood-fibres, 250 ; foi'mation of, in 

 pistils, 70, seqq. 



Sex, sudden appearance of, 338 ; 

 arrest of, 246 ; change of, in Calen- 

 dula, 241 ; origin of, 246, 249 ; of 

 seeds, 247 ; and soil, 239 ; and 

 temperature, 237 



Sexuality, in Calendula, 241 ; in Cen- 

 taurea, 240 ; and environment, 

 230, 245 ; and heterogamy, 243 ; 

 and heterostylism, 244 ; and nutri- 

 tion, 233, seqq. ; and soil, 239 



Solution, explained, 5 



Spring, in corolla of Genista, (fig. 47) 

 160; of stamens in Medicago, (fir. 

 49) 162 ; of styles 125, of Viola, 

 (fig. 54) 255 



Stamens, adelphous, and nectaries, 58 ; 

 adhesion of, and mechanical forces, 

 81 ; cohesion of, 57 ; declinate, 



• 110, 125, in Dictamnus, (fig. 33) 

 110; in Echium, (fig. 20), 82; in 

 Epilohium, (fig. 34), 111; dimorphic, 

 (fig. 37) 121; distribution of forces 

 in, 81, 126 ; with heterostylism, 

 203, seqq. ; irregularity in, origin of, 

 109 ; irritability of, 159, 161 ; more- 

 ment of, 162 ; metamorphoses of, 

 292, 298 ; petaline, cause of absence 

 of, 7, 20 ; whorls, number of, 8 



Staminode, movement of, in Lopezia, 

 (fig. 48) 161 



Stigmas, of anemophilous flowers, 

 269 ; of Aristolochia, (fig. 21) 83 ; 

 of heterostyled flowers, 216; irri- 

 tability of, 115, 163; long-lived, 

 269 ; movements of, 162 ; by pro- 

 toplasmic continuity, 163 



Stimulus, produced by crossing, ad- 

 vantages of, 330 ; temporary effect 

 of, 312, 330 



Stipules, of Acacia sphcerocephala, due 

 to irritation, 157 ; nectariferous, 

 of Impatiens, (fig. 43) 140 



Strains, effect on boughs, (fig. 39) 125 ; 

 and cohesions, 51, 53 ; hypertrophy 

 by, in pears, (fig. 38) 124, in pedi- 

 cels, 123, on stems, 123, on struc- 

 tures, 123 seqq. 



Struggle for existence in seedliug.s, 

 period of greatest, 330 



