492 



MESSRS. F. GOTCH AXD V. HORSLEY 



obvious what an extraordinarily small reading this is when compared to that which is 

 observed in a peripheral nerve, or even the peripheral portion of a divided posterior 

 root, which, with a stimulus of one-fifth the intensity (500), and similar duration, 

 averages 227 scale, and once reached a maximum of 445 scale. 



Fig. 20. 



This definite result is very significant, but before enlarging upon it we w ill describe 

 the values obtained for the " crossed " reflex. 



(b.) Crossed Reflex. To obtain the value of a crossed reflex discharge in the 

 peripheral nerves, we divided, as before, the cord in the dorsal region, and then 

 prepared one sciatic nerve for connection with the galvanometer, and next, either 



