UPON ELECTRICAL STIMULI GENERALLY 51 



this side-growth, and root-filaments appeared above 

 the surface of the soil. 

 A, on the other hand, had only five shoots, none of them 

 more than f-inch by ^-inch at base, but very 

 numerous side shoots, |-inch thick and at least one 

 nearly 1-inch in length. Of these I counted seven- 

 teen, not including filamentary growths, which, 

 however, were nearly so numerous as in B. 

 Removed from the pot and the soil washed away, B was 

 seen to be destitute of root development (it having only 

 two root-hairs depending from one shoot and these only 

 If -inches in length). The tuber was rather flabby and 

 shrivelled. 



Here the upward driving force had only manifested itself 

 in the thick crowded upper growth to the neglect of root 

 production and of shoots below the soil such as were exhibited 

 by A. 



Upon removing A from the pot a dense root growth was 

 seen, with three other shoots growing upwards (making 

 twelve in all) and there was no shrinkage of the tuber, nor 

 any sign of young potatoes. Cut in section the tuber was 

 perfectly firm and fresh ; a slight discolouration, due to 

 electrolysis, merely showing where the needle had entered. 

 B, however, when cut was not only flabby and somewhat 

 shrivelled but both halves soon after turned brown, except 

 in a curve from top to bottom so that they appeared thus : 



The parts cross-hatched were very flabby. 



