90 ON THE INTERNAL POLARISATION OP NERVES. 



From all these experiments it appears that when the polarising 

 current is opened, polarisation reaches its highest value instantane- 

 ously, and after that declines continuously. This decline proceeds 

 at first very rapidly, afterwards more and more slowly, so that the 

 polarisation lasts a long time after the current is shut off, and ap- 

 proaches the zero point only asymptotically. 



