56 CHAP. VI. RELATION OF TURGOR AND TENSION 



Table IV. — Effect of Alternate Variations of Turgor 

 ON Growth (Zephyranthes). 



essentially similar to that of a growing organ. Illustrative 

 examples of this will be given in a later chapter. In order 



Fig. 26. Response of the pulvinus of Mimosa to irrigation 

 and to withdrawal of water. 



Increased turgor by application of water at point marked with 

 vertical arrow induced erectile movement. Diminution of 

 turgor by application of KNO3 solution at the point marked 

 with the horizontal arrow brought about the fall of the 

 leaf. Successive dots at intervals of 10 seconds. (The 

 down-curve represents up-movement and vice versa.) 



to observe the effect on a motile organ of the supply or 

 withdrawal of water, Mimosa in a condition of drought 

 may be taken, when its leaves are in a somewhat drooping 



