X 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. Eise 

 of temperature. 139. Work done during imbibition. 140. Polari- 

 soope. 141. Polariscope, observations on strained glass rods. 

 142. Traube's artificial cells. 143. Slowness of diffusion. 144. Ee- 

 lation of membrane to diffusing fluid. 145. Absorption of methylene 

 blue by living cell PP- lOl— IIB. 



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

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

 in terms of KNO3. 149. Isotonic coefficient. 150. Do., micro- 

 scopic method. 151. Hydrostatic pressure in turgescent tissue. 

 152. Pfeffler's "gypsum method pp. 113—121, 



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

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

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

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

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

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

 ting a root. 165. Splitting a' pulviuus . . pp.121 — 129, 



CHAPTER VI. 



GROWTH. 



Section A. Esiperinients without fecial apparatus. 166. Method. 

 167. Free oxygen necessary. 168. Eespiration necessary. 169. Full 

 turgescenoe necessary. 170. Growth at various temperatures. 



pp. 1 30— 133. 



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. 133 136. 



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- 



