49(; 



LIFE MOVEMENTS IN PLANTS 



negativity, exhibits inaxirnuin nosltivity when placed l).4o\v. 

 METHOD OF TRANSVERSE PERFORATION. 



Experiment 191.— 1 next carried out a complete explora- 

 tion of the interior of the organ along the diameter. The 

 probe started from the upper surface, aud came out at 

 the lower by successive steps of 0*2 mm., the correspond- 

 ing geo-electric effects being observed at each step. It has 

 to be borne in mind that the successive readings were 

 obtained by rotation from vertical to -h90 (A above); 

 the rotation was never carried out in the negative direc- 

 tion through - 90°. But the probe entering from above 

 passed the central axis, and entered a region where the 

 gilvanometric iiulication was transformed from negative to 

 positive. The following table gives the results obtained 

 with the flower stalk of Nynipfuea. 



TAI'.I.K XLIV. — SHOWIN'G THE INDUCED GEO-ELECTRIC DISTRIBUTION ACROSS 



THE FLOWER STAi.K OF Nymphcea (diameter = 6 '8 mm.) 



