CONTENTS 
CuHaptTer III]. Tue Plant 
STIMULUS AND RESPONSE 
General Relations 
144. 
145. 
146. 
147. 
148. 
149. 
150. 
151. 
The nature of stimuli 
The kinds of stimuli 
The nature of response 
Adjustment and adaptation 
The measurement of response 
Plasticity and fixity 
The law of extremes : 
The method of working hopeless 
Hydroharmose 
Adjustment 
152. 
153. 
154. 
155. 
156. 
157. 
158. 
159. 
160. 
Water as a stimulus ‘ 
The influence of other factors ape water . 
Response : 
The measurement of Absotution. 
The quantitative relation of absorption and asieton 
Measurement of transpiration 
Field methods 
Expression of results . 
Coefficient of transpiration 
Adaptation: 
161. 
162. 
163. 
164. 
165. 
166, 
167. 
168. 
169. 
170. 
171. 
Modifications due to water stimuli 
Modifications due to a small water supply . 
The decrease of water loss . 
The increase of water supply ° i 
Modifications due to an excessive water supply. 
Plant types 
Xerophytic types 
Types of leaf xerophytes 
Types of stem xerophytes . 
Bog plants . 
Hydrophytic types 
Photoharmose 
Adjustment 
172. 
173. 
174. 
175. 
Light asastimulus . : . ‘ : : ‘ 
The reception of light stimuli 
The response of the chloroplast . 
Aeration and translocation . 
