Contents. xi 



PAGE 



126. Motor zone in Coleus . . . . . . .116 



127. Influence of light on form 117 



128. Movements due to intensity of light 117 



129. Geotropism : reaction to gravity 118 



130. Progeotropism 120 



131. Location of the "motor zone ....... 121 



132. Diageotropism of roots ........ 121 



133. Movements in response to a combination of geotropism and 



phototropism . . . . . . . .122 



134. Hydrotropism of roots 122 



135. Influence of water on form of leaves ..... 123 



136. Chemotropic movements of pollen tubes . . . .124 



137. Movements in response to shock 125 



138. Movements of stamens, etc., in response to shock . . 126 



139. Movements of tendrils in response to contact . . .127 



140. Circumnutation of growing organs 128 



141. Carpotropic movements . . . . . . . 129 



142. Carpotropic movements of pedicels of Claytonia Virginica . 131 



143. Carpotropic curvatures of Streptocarpus . . . .131 



144. Complex movements of inflorescence of A Ilium . . . 132 



INDEX 135 



