CONTENTS. XI 



soopic method. 186. Growth and temperature, anxanometer. 

 187. Growth and light, auxanometer. 188. Growth and light, 

 Phyoomyces. 189. Growth and light, Sinapia. 190. Periodicity, 

 auxanometer pp. 136 — 149. 



CHAPTER VII. 



CURVATURES. 



Section A. Geotropism. 191. Eegion of growth and region of 

 curvature, roota. 192. Do., sterna. 193. Subsequent change in 

 curvature. 194. Grass-haulms. 195. Noll's experiment, graaa- 

 haulms. 196, 197. Geotropism and respiration. 198. Johnson's 

 experiment. 199. Pinot's experiment. 200. Knight's experiment. 

 201. Sudden curvature. 202, 203. After effect . pp. ISO— 158. 



Section B. Curvatures due to injury &c. 204. Decapitated 

 roots. 205. Decapitation prevents perception of stimulus. 206. Ee- 

 covery after decapitation. 207. Curvature due to injury. 208. Cie- 

 sielski's experiment. 209. Drooping of leaves in frost pp. 159 — 164. 



Section C. HeliotroplBm. 210. Positive heliotropism. 211. After 

 effect. 212. Light of high refrangibility most effective. 213. Nega- 

 tive heliotropism. 214. Light and gravity acting together. 215. Trans- 

 mitted stimulus pp. 165 — 168. 



Section D. Diabellotropism, diageotropism &e. 216. Diahelio- 

 tropism. 217. Due to specific sensitiveneaa, Minoatat. 217 a. Ex- 

 clusion of helio- and geotropism. 218. Eectipetality. 219. Theory 

 of klinostat, grass-haulms. 220. Do., Cucurbita. 221. Diageo- 

 tropism, roots. 222. Growth of secondary roota in light. 223. Dia- 

 geotropiam, Narciasua. 224. Horizontal branchea. 225. Torsion 

 of interuodea. 226. Buds of the yew. 227. Epinasty. 228. Epinasty 

 and geotropism. 229. Nutation of epiootyla . pp. 168 — 183. 



CHAPTER VIII. 



FURTHER EXPERIMENTS ON MOVEMENT. 



Section A. Stimulus of contact, chemical agency, moisture, 

 changes in illumination and temperature. 230. Tendrils, sensi- 

 tive to contact. 281. Tendrils, De Vries' injection experiment. 



