CANCER 



137 



three days and exhibited abnormal upward growth in the 

 direction of the current, the edible part being absent. Speci- 

 mens of both are shown in the following illustration : 



a. Electrified. 



y^.^2 



b, Contxol from open ground. 



A second experiment was with roots of grass. Both were 

 identical as regards size and weight and the blades were 

 cut 2-inches above the soil. No. 1 was electrified by means 

 of a dry cell (positive to bottom, negative to top) and the 

 other (No. 2) grown under normal conditions, in a cool 

 greenhouse. The respective rates of growth were as follows : 



Height of blades — 



Aug. 4. Aug. 13. Aug. 17. Aug. 22. Sept. 14. 



No. 1 2-ins. 6-ins. 8-ins. 10|-ins. 14-ins. 



^o. 2 2-ins- 2f-ins. 3|-ins. 5-ins. 8-ins. 



But there was this essential difference between the two. 

 The blades of No. 1 were of hair-like proportions whereas 

 those of No. 2 were vigorous and sturdy and far fewer in 



