EFFECT OF IRRITATION OF A POLARIZED NERVE. 



405 



Ill experiment 189 the descending irritating ciirrenf was kept of the 

 same strength (1 Daniel ceil) throngliont the experiment. With de- 

 scending polarization, 1 Daniel, " rheochord 57," the excitability of the 

 nerve was increased. With 1 Daniel, "rheochord 48," the excitability 

 remained unaffected. Further increasing the strength of the polarizing 

 current to " rheochord 28," an increased excitability is iiro<luce(l for the 

 descending current and increased for the ascending. On increasing it 

 still further to " rheochord 18," the excitability of the nerve remained 

 nnintlnenced by the descending constant current. A i)olarizing current 

 of still greater strength diminished the excitability of the nerve. 



