MKSSKS. K. (iOTCII AND V. IIOKSIiKY 



2, Altfi ddonn In 



Difference. 



( I.) Physical C/utnycu. -Tim alterations due to drying probably have the same 

 influence as that already alluded to in (.he case of the sciatic nerve. The amount of 

 tho difference noticed immediately after section generally increase! slowly and steadily, 

 and, at least partially, IV&amp;lt;&amp;gt;m this cause. There is, however, a noticeable check in the 

 rise after I he first five minutes, after which the difference then only in some cases 

 begins to fall. 1 1 once either the rise is accentuated at h rst by some other agency, or 

 it is counterbalanced by the depressant effects duo to loss of vitality. 



(l&amp;gt;.) Physiological Clutni/i-n. Tins amount of tho difference in tho root diminishes 

 with greater rapidity than in tho case of the nerve trunk, in consequence of systemic 

 death. A similar fall occurs if tho root is severed from its central connection. This 

 is illustrated by tho following series of experimental observations made before and 

 after the death of t IK 



UlI T 7th Lumbar Posterior Root.* (Cat, M 2.) 

 Hoot Divided near Ganglion and Central End Connected with Electrodes. 



UooT cut i iff from Cord. 



In another animal after systemic dwth had caused a decline in the amount of 

 difference, severance of the root caused no further appreciable decline. 



Sri, 



::,. 



