49s 



LIFE MOVEMENTS IN PLANTS 



from the lower side. The points of maximum positivity 

 und negativity are situated symmetrically on the opposite 

 sides of the organ. The electric variation of maximum 

 positivity on the lower side is comparatively feeble, less 

 than half the corresponding maximum negativity on the 

 upper side. Microscopic section showed that the geo- 

 perceptive layers were the same as the starch-crescents. 



Experiment 192. — I carried out similar experiments with 

 the shoot of BryopkijUum. The results are given in 

 Table XLV ; the curve of the electric distribution along the 

 diameter is seen in figure 178. The characteristics of this 

 curve are the same as that of Nymphcea. The maximum 

 galvanometric negativity occurred at the depth of 0-tt mm., 

 and of positivity at a corresponding point on the opposite 

 side. 



TAHLE XI,V. -SHOWING IN'DUCKD GEO-ELECTRIC DISTRIBUTION ACROSS THE 



STEii: OF Bryophyllum (diameter = 3"6 mm.). 



Microscopic examination showed that the electric maxima 

 in Bryophyllum coincided with the diametrically opposite 

 points in the continuous endodermic ring. In Bryophylhim 

 as in Nymphcea, the excitatory galvanometric negativity of 

 the upper geo-perceptive layer is greater than the induced 



