28 



Avei-age growth of radicles and hypocotyls and gain per cent by 

 treatment in Tables XII.— XVII. 



Kind of Current. 



Normal l 1.95 



Interrupted induced | 2.9G 



Inter'pt'd induced 10 interruptions 2.93 



Direct 



e> 





 51.79 

 50.25 



2.47 ' 2fi.G6 



S a a 



5)= 2 2 



4.00 

 4.G7 

 4.52 

 4.17 



O 



5.74 

 1.01 



It will be noticed from these results that the interrupted induced 

 current where ten interruptioiis were used gave the highest percentage 

 of germination, but the experiments have not been repeated enough 

 times to definitely ascertain whether this will always follow. It will 

 also be noticed that the interr-upted induced cuirent where the Wag- 

 ner hammer was used gave a much longer growth of radicles and 

 hypocotyls, and in fact this form of current has given the best 

 results in all the experiments which were carried out. 



Where the direct current was used, the gain w^as not so high as 

 with the other forms. These experiments and others which have 

 been made since, seem to prove that the optimum strength of direct 

 ■current is of somewhat lower voltage than with the induced current, 

 and that the cause of the low gain per cent in the tables is due to the 

 fact that the opiimum strength of direct current was not used. 



Again it will be seen in the^e tables tis in Tables I. — XI. that the 

 percentage of germination at the end of 72 hours is much smaller 

 than at 24 hours showing that germinal ion was accelerated by treat- 

 ment. Also the increase growth of radicles at the end of 96 hours 

 was smaller than the increase growth in 72 hours which shows that 

 the stimulating effect is gradually lost where the seeds are treated 

 but once. The low percentage in gain in the hypocotyls is due to 

 the same cause. 



