INDEX 



293 



polarity of, 159; shortening of, on 

 plasmolysis, 60 ; verticibasality of, 156; 

 S. orbicularis, amitbsis in, 43 ; S. 

 princeps, growth of, 19. 



Spores, germination of, on water and on 

 nutrient solutions, 113; influence of 

 coloured light on growth and germina- 

 tion of, 102; food on production of, 

 1 1 6 ; light on, 247 ; on forma- 

 tion of, 90 ; - on germination of, 

 92 ; limits of temperature for formation 

 and germination of, 80 ; resistance of, 

 to heat, 226, 227; resting periods of, 

 207; vitality of, 254, 255. 



Sporodinia, influence of moisture on for- 

 mation of spores in, 123 ; S. grandis, 

 influence of oxygen on reproduction 

 of, 117. 



Sporophores, influence of light on develop- 

 ment of, 90 ; strains in, 63. 



Sporophylls, influence of contact on forma- 

 tion of, 130. 



Sports, 192. 



Spot-disease, 174. 



Staby, 217. 



Stahl, 11, 42, 87, 92, 93, 94, "9, I2I > i?i ; 

 on influence of changes of concentra- 

 tion, 257; -- light on lichens, 154; 

 on polarity, 157 ; on protective adapta- 

 tions, 54. 



Staminal filaments, elongation of cells of, 

 59; rate of growth of, 17 ; transmission 

 of stimuli in, 185. 



StammerofF, 17; on influence of light on 

 growth of roots, 96. 



Standfuss, 8l. 



Stange, 101, 118, 119. 



Starch-grains, growth of, 35 ; solution of, 36. 



Starvation, influence of, on resistance to 

 desiccation, 253. 



Stebler, 10, 96 ; on periodicity, 204. 



Stellaria media, influence of cold and 

 thawing on, 234 ; frequent thawing 

 on, 235 ; resistance of, to cold, 232. 



Stems, influence of light on, 86, Fig. 18. 



Stenstrom, 100, 237. 



Stephanidis, 116. 



Sterigmatocystis, influence of tension on 

 attachment of, 129 ; S. alba, influence 

 of inversion on, no; induced varia- 

 tion of, 194. 



Stevens, 259, 260, 273. 



Sticta pulmonacea, residual water of, 251. 



Stigeoctomum^ influence of saline solutions 

 on, 1 1 8. 



Stimuli, classification of, 74, 75 ; correlative, 

 165; functional, 166; rapidity of trans- 

 mission of, 185, 186; transference of, 

 181-5. 



Strains, in cuticle and cell-wall, 65, 66; in 

 starch-grains, 37 ; in tissues, 61 seq. ; 

 origin of, 34; longitudinal, 62; 

 transverse, 62. 



Strasburger, 13, 31, 33, 39, 40, 43, 96, 98, 

 148, 171, 174, 176, 231, 236 ; on annual 

 rings, 216; on growth by apposition, 

 29 ; of wall of pollen-grains, 30. 



Streaming, action of poisons on, 264 ; influ- 

 ence of magnetism on, 107. 



Strehl, 12, 87, 96, 204. 



Streptocarpus, influence of removal of coty- 

 ledon of, 162. 



Stresses in tissues, 61 seq. 



Stretching, relation of, to elasticity and 

 osmotic pressure, 59. 



Strub, 227. 



Strychnine, poisonous action of, 260. 



Strychnos laurina, strength of tendril of, 50. 



Sub-cooling, 239, 244 ; in plants, 242, 243. 



Suberization, influence of, on elasticity, 55. 



Substitution, influence of, on poisonous 

 action, 210. 



Sugar, influence of, on germination, 113; 



on resistance to cold, 247 ; vitality 

 of plasmolysed cells in, 257. 



Sulphate of copper, dissociation and poi- 

 sonous action of, 273. 



Sulphur-bacteria, optimal percentage of 

 oxygen for, 114. 



Surface-tension, influence of, 179,180; 

 on cell-division, 41. 



Surmont, 193. 



Swarm-spores, influence of change of tem- 

 perature on production of, 82. 



Symbiogenesis, 189, 190. 



Symbiosis, changes of shape due to, 170 ; 

 conditions for, 177. 



Symbiotic action, details of, 176. 



Symmetry in cell-division, 47. 



Syringa, early flowering of, 205 ; influence 

 of transitory cold on, 210 ; S. vulgaris, 

 shortening of resting period of, 209. 



Taeniophyllum Zollingeri, influence of light 

 on aerial roots of, 87. 



Tammann, 244. 



Tammes, 247, 249. 



Taphrina^ galls due to, 171. 



Taraxacum, contraction of hypocotyl of, 

 14; influence of moisture on length of 

 internodes in, 100; T. Dens-Leonis, 

 curvatures in split peduncle of, 61. 



Tassi, 113. 



Taxus, dorsiventrality of leaves of, 153. 



Temperature, cardinal points for, 76; for- 

 mative changes due to, 81 ; influence of, 

 on action of poisons, 262 ; on growth, 

 75 ; on leaf-fall, 217, 218 ; on 

 length of internodes, 100 ; on mo- 

 tility of pulvini, 67 ; on partheno- 

 genesis, 147; on periodicity, 210; 



on tissue-strains, 67 ; on varia- 

 tion, 194, 195 ; low, effects of, on plants, 

 232-8 ; production of death by, 

 244 ; supra-maximal, influence of, 224 ; 

 ultra-maximal, 225. 



