XIV CONTENTS. 



tive to contact. 231. Tendrils, Pfeffer's contact experiment. 232. Mi- 

 mosa, movements produced by stimulation, 233. Mimosa, temperature. 

 234. Mimosa, darkness. 235. Mimosa, continued stimulation. 

 236. Oxalis acetosella, sensitiveness. 237. Oxalis, Briicke's experi- 

 ment. 238. Drosera, stimulated by meat. 239. Do., by inorganic 

 matter. 240. Drosera stimulated by dilute solutions. 241. Drosera, 

 inflection indirectly caused. 242. Berberis, irritable stamens. 

 243. Berberis, effect of chloroform. 244. Stigma of Mimulus. 

 245. Centaurea, irritable stamens. 246. Phycomyces, curvature 

 towards iron. 247. Hydrotropism. 248. Movement of chloroplasts. 

 249. Chemotaxis, antherozoids. 249 a. Chemotaxis: bacteria. 

 249 b, c. Do., pollen tubes. 250. Opening and closing of tulip, 

 temperature. 251. Tulip, sensitive to small change of temperature. 

 252. Crocus, mechanism of movement. 253. Light and darkness, 

 daisy. 254. Light and darkness, Trifolium. 255. Nyctitropic 



movements, Trifolium. 256. Do., Mimosa, self-recorded. 257. Para- 

 heliotropism, Averrhoa pp. 200 — 226. 



Section B. Autonomous movements. Periodicity. 258. Cir- 

 cumnutation. 259. Do., twining plants. 260. Autonomous 



movements, Trifolium. 261. Do., Averrhoa. 262. Do., Desmo- 



dium. 263. Periodicity, light and darkness, daisy. 264. Perio- 



dicity, temperature, daisy. 265. Contrast, daisy pp. 227 — 234. 



PART II. 



CHEMISTRY OF METABOLISM. 

 CHAPTER IX. 



INTRODUCTION. SOLVENTS. METHODS OF EXTRACTION. 

 GENERAL NOTES ON APPARATUS AND MANIPULATION. 



Introductory. Preparation of material to be examined. Preparation 

 of extracts : non-nitrogenous plastic substances. Preparation of ex- 

 tracts: nitrogenous plastic substances. Filtration. Evaporation of 

 solutions. Changes occurring in solutions on keeping pp. 237 — 248. 



