Xll 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. Eelation of membrane to diffusing fluid. 145. Absorp- 

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



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

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

 in terms of KN0 3 . 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 pulviuus . . . pp.133 141. 



CHAPTER VI. 



GROWTH. 



SECTION A. Experiments without special apparatus. 166. Method. 

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

 of salt solution. 170. Growth at various temperatures. 



pp. 142145. 



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- 



