XU CONTENTS. 



temperature effect. 130. Imbibition ; salt solution. 131. Stipa, 

 action of. 132, 133. Stipa, temperature. 134. Stipa, salt solu- 

 tion. 135. Stipa, mechanism of movement. 136. Nobbe's ex- 

 periment. 137. Variability in the swelling of seeds. 138. Kise 

 of temperature accompanying imbibition. 139. Work done during 

 imbibition. 140. Polariscope. 141, Polariscope, observations on 

 strained glass rods. 142. Traube's artificial cell. 143. Slowness of 

 diffusion. 144. Kelation of membrane to diffusing fluid. 145. Absorp- 

 tion of methylene blue by living cell . . . . pp. 112 — 124. 



Section B. Tiirgor. 146. Plasmolysis, microscopic observations. 

 147. Kecovery after plasmolysis. 148. Osmotic strength of cell-sap 

 in terms of KNOg. 149. Isotonic coefficient. 150. Do., micro- 

 scopic method. 151. Hydrostatic pressure in turgescent tissue. 

 152. Pfeffer's gypsum method pp. 125—132. 



Section C. Tensions of tissues. 153. Longitudinal tensions. 

 154. Extension of pith in water. 155. Changes in transverse di- 

 mensions of pith. 156. Tangential dimension. 157. Shortening 

 of roots. 158. Imperfect elasticity of tissues. 159. Cyclometer. 

 160. Hofmeister's experiment. 161. Loss of rigidity. 162. In- 

 crease in length. 163. Splitting turgescent tissues. 164. Split- 

 ting a root. 165. Splitting a pulvinus . . . pp.133 — 141. 



CHAPTER VI. 



GROWTH. 



Section A. Experiments witliout special apparatus. 166. Method. 

 167. Free oxygen necessary. 168. Respiration necessary, 169. Effect 

 of salt solution. 170. Growth at various temperatures. 



pp. 142—145. 



Section B. Distribution of growth. 171. Distribution in roots. 

 172. In air-roots. 173. In stems. 174. Grand period, time 

 observation. 175. Growth and plasmolytic shrinking pp. 146 — 148. 



Section C. Auxanometers. 176. Methods. 177. Descent 

 of the weight measured on a scale. 178. Micrometer screw. 

 179. Arc-indicator. 180. Microscope. 181. Self-recording aux- 

 anometer. 182. Do., simple form. 183, 184. Growth and tem- 

 perature, microscopic method. 185. Growth and respiration, micro- 



