CONTENTS. XIU 



scopic method. 186. Growth and temperature, auxanometer. 



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



Phycomyces. 189. Growth and light, Sinapis. 190. Periodicity, 

 auxanometer ........ pp. 149 — 162. 



CHAPTER VII. 



CURVATURES. 



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

 curvature, roots. 192. Do., stems. 193. Subsequent changes in 

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



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. 163—172. 



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



roots. 205. Decapitation prevents perception of stimulus. 205 a. Do., 

 Pfeffer's experiment. 206. Recovery after decapitation. 207. Cur- 

 vature due to injury. 208. Ciesielski's experiment. 209. Drooping 

 of leaves in frost pp.173 — 179. 



Section C, Heliotropism. 210. Positive heliotropism. 211. After 

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

 tive heliotropism. 214. Struggle between the effects of light and 

 gravitation. 215. Transmitted stimulus . . pp. ISO — 183. 



Section D. Diaheliotropism, diageotropism &c. 216. Diahelo- 

 tropism. 217. The movements due to specific sensitiveness ; klinostat. 

 217 A. Exclusion of helio- and geotropism. 218. Rectipetality. 



219. Theory of klinostat, grass-haulms. 220. Do., Cucurbita. 



221. Diageotropism, roots. 222. Growth of secondary roots in Hght. 

 223. Diageotropism, Narcissus. 224. Horizontal branches. 225. Tor- 

 sion of internodes. 226. Buds of the yew. 227. Epinasty. 

 228. Epinasty and geotropism. 229. Nutation of epicotyls 



pp. 184—199. 



CHAPTER VIII. 



FURTHER EXPERIMENTS ON MOVEMENT. 



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

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



