3 JO 



MESSRS. F. GOTCH AND V. HORSLEY 



Excitation of left lateral produced effect of 68 



right 36 



left posterior ,, 96 



right 89 



Fig. 17. 



It thus appears that when half the split cord is observed and the columns excited 

 on the central side, the excitatory electrical change, produced by weak excitation of 

 the lateral column is entirely confined to the side stimulated, whilst that produced by 

 similar excitation of the posterior column is but mainly confined to the stimulated 

 side, while when the excitation is of sufficient intensity it is produced equally on 



