ELECTRICAL POLARITY IN OBELIA 



485 



in table 1 should be judged in the light of the results brought 

 out in tables 2 and 3, and the experiments given below. 



TABLE 2 



Shotting absence of an electrical difference of potential in stems from two colonies 

 which had been alloioed to die in sea-water. A gives the tests on the viain stem 

 immediatehj after removing branches. B, tests on same stems after washing in 

 fresh sea-water 



Stems killed in chloroform. The apical halves of the main 

 stem of five different colonies were isolated and the apical inter- 

 node removed from each one. The pieces were tested im- 

 mediately. In table 4 A are given the results. It will be noted 



