THE CONDUCTIVITY BALANCE 



487 



induces depression, which sets in earlier in the case of NaBr. 

 The effect of these two reagents on vegetable nerve is pre- 



FIG. 295. Photographic Record showing Depression of Responsive 

 Excitability by Application of KC1 



cisely the same, as will be seen from an inspection of the 

 record given in fig. 296. The NaBr was applied on the 





FIG. 296. Photographic Record exhibiting Comparative Effects of 

 NaCl and NaBr on Responsivity 



NaCl was applied on E' and NaBr on E, the formula being E' NaC iENaBr- 

 The record shows the greater and earlier effect of NaBr at E in 

 causing relative excitation followed by relative depression. 



right-hand side E, and NaCl on the left-hand E', a process 

 which is expressed, for the sake of brevity, by the formula 

 E' NaC1 E NaBr . The greater and earlier, excitatory effect of 



