CONTENTS. Xlll 



scopic method. 186. Growth and temperature, auxanometer. 

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

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

 auxauometer pp. 149 162. 



CHAPTER VII. 



CURVATURES. 



SECTION A. Geotropism. 191. Region 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. Localisation of sensitive region in Sorghum. 

 207. Curvature 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. Eectipetality. 

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



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

 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. 184199. 



CHAPTER VIII. 



FURTHER EXPERIMENTS ON MOVEMENT. 



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

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



