Index. 



289 



Scilla nutans, stomata of, 243, 245. 



styles of, 246. 



suspensor of, 248. 



syncarpous fruit of, 248. 

 Sclerenchyma, 152. 



Section, optical, 6, 74, 89, 120. 

 Seed, 211, 212. 



of Pinus, 206. 



Ranunculus, 230, 236. 



Scilla, 248. 

 Seed-coat of peas, 269. 



Pinus, 206, 209, 212. 



Ranunculus, 236. 



Scilla, 248. 



Seed-cones, last three or more seasons, 

 204. 



of Pinus, 204. 



replace long shoots, 204. 

 Seed- Plants, 213. 



and ferns distinguished, 178, 211. 



sub-divisions of, 215. 

 Seed-scale corresponds to ligule, 205. 

 Seeds, transport of, 274. 

 Segregation of determinants, 264, 278. 

 Setaginella martensii. Lecture XXL, 



170-178 (Figs. 44, 45,46, 47, 48, 



49,i5o)- 

 archegonium of, 176. 



anther idium of, 177. 

 bast of, 173. 



chloroplasts of, 172. 



conducting tract of, 173. 

 embryo of, 176. 



endodermis of, 173. 



fertilisation of, 176, 178. 

 foot of, 176. 



gametophyte, female, 176. 



of, male, 175. 



germination of megaspores of, 175. 

 microspores of, 175. 



heterosporous, 178. 



leaves of, 171, 173. 

 ligule of, 171, 273. 



megasporangia of, 173. 



megaspores of, 173. 



microsporangia of, 173. 



microspores of, 173. 

 ova of, 176. 



protoxylem of, 173. 

 rhizophore of, 171. 



root-cap of, 173. 

 sperms of, 175. 



sporangia of, 172, 173. 

 sporophylls of, 173. 



stem of, 172. 



suspensor of, 176. 



tapetum of, 174. 



tracheids of, 173. 

 Selection, natural, 277. 

 Self, 262. 



Semi-permeability, destruction of, 15, 16, 



Selni-permeable membranes, 14. [93, 99. 



Sepals, 230, 246. 



Seta, 140. 



Sexual reproduction, 39, 72, 109, no, in. 



and asexual reproduction con- 



trasted, III, 112. 



hunger stimulus and, 40. 



of Chlamydomonas, 39. 



Fucus, 107, 108, 109, no, in. 



Mucor, 94, 95. 



Penicillium, 100, 101. 



Polysiphonia, 117-120. 

 Spirogyra, 72. 



Vaucheria, 87, 88, 89. 



Volvox, 79. 



origin of, 40. 



Sheath of bundle or conducting tract. 



Aspidium, 152. 



Ranunculus, 217, 218, 219. 



Sieve-plates, 150, 220. 



Sieve-tubes, 150, 220. 



Sol, 21, 22. 



Solution of crystalloids, n, 12, 21. 



Smear-preparation, 27, 56, 64. 



Soma, an excrescence on germ-cells, 82. 



Somatic cells, 81. 



diploid, 255. 

 Sorus, 161. 



Souring of beer and wine, 65. 



milk, 65. 



Species, immutability of, 271. 

 mutable, 276. 



origin of, 270 et seqq. 



physiological, 65. 

 Spindle, achromatic, 252. 

 Spireme, 253. 



Spirogyra porticalis. Lecture IX., 67-74 

 (Figs, n, 12). 



cell-division of, 70. 



cell-wall, 68, 70, 71. 



chloroplast of, 68, 69, 72. 



conjugation of, 70, 71, 73. 



conjugation-tubes of, 73. 



holophytic, 69. 



metabolism of, 69. 



nucleus of, 69. 



photosynthesis of, 69. 



pyrenoids of, 69. 



reconstruction of transverse section 



of, 68. 

 reproduction of, 70, 71. 



respiration of, 69. 



sexual differentiation of, 73. 

 sucker of, 71. 



waste products of, 69. 



zygospore of, 71, 72. 

 Spongy parenchyma, 155. 

 Spontaneous generation, 58. 

 Spore, 25, 26, 39. 



