. Ill _.. 



TROPISTIC MOVEMENTS. 



97. Negative geotropism of stems. The plant was placed on its side in 

 darkness two days ago. Ink marks show the position and nature of the curvature, as 



in No. 96. 



98. Diageotropism of leaves seen by placing a plant on its side in the dark. 



99. Diageotropism of lateral roots. 



15 



