CONTENTS 



Chapter III. The Plant 



145. 

 146. 

 147. 



STIMULUS AND RESPONSE 



General Relations 



144. The nature of stimuli 

 The kinds of stimuli . 

 The nature of response 

 Adjustment and adaptation 



148. The measurement of response 



149. Plasticity and fixity 



150. The law of extremes . 



151. The method of working hypotheses 

 Hydroharmose 



Adjustment 



152. Water as a stimulus .... 



153. The influence of other factors upon water 



154. Response 



155. The measurement of absorption . 



156. The quantitative relation of absorption and transpiration 



157. Measurement of transpiration 



158. Field methods 



159. Expression of results . . . . 



160. Coefficient of transpiration 

 Adaptation 



161. Modifications due to water stimuli 



162. Modifications due to a small water supply 



163. The decrease of water loss . 



164. The increase of water supply 

 Modifications due to an excessive water supply 

 Plant types 

 Xerophytic typos 

 Types of leaf xerophytes 

 Types of stem xerophytes 

 Bog- plants . 

 Hydrophytic types 



165. 

 166. 

 167. 

 168. 

 169. 

 170. 



17L 

 Photoharmose 

 Adjustment 



172. Light as a stimulus 



173. The reception of light stimuli 



174. The response of the chloroplast 



175. Aeration and translocation . 



PAGE 



100 

 100 



lOI 



102 

 103 

 104 



105 

 106 



107 

 107 

 108 

 109 

 III 



113 

 114 

 116 

 117 



118 

 118 

 118 

 121 

 121 

 122 

 122 

 123 



125 

 126 

 127 



129 



131 

 132 



134 



