82 LABORATORY GUIDE IN PHYSIOLOGY. 



Law II. A law of Electrotonus. 



The passage of a constant current through a nerve induces a 

 condition of electrotonus, marked by an increased irritability 

 in the region of the kathode, and a decreased irritability in 

 the region of the anode. 



Law III. A law of Electrotonus. 



During electrotonus induced by a strong current the con- 

 ductivity is decreased in the region of the anode. 



With the- help of these laws account for all the typical 

 phenomena observed above. 



