CHAPTER XVI 
INORGANIC RESPONSE—EFFECT OF CHEMICAL REAGENT 
Action of chemical reagents—Action of stimulants on metals—Action of 
Effect of ‘ poisons’ on metals—Opposite effect of 

depressants on metals 
large and small doses, 
We have seen that the ultimate criterion of the physio- 
logical character of electric response is held to be its 
abolition when the substance is subjected. to those 
chemical reagents which act as poisons. 
Action of chemical reagents.—Of these reagents, some 
are universal in their action, amongst which strong 
solutions of acids and alkalis, and salts like mercuric 

Before 4 After 
Fic. 88.—Action oF Porson in ABonisHinc Response In Nerve (WALLER) 
chloride, may be cited. These act as powerful toxic 
agents, killme the living tissue, and causing electric 
response to disappear. (See fig. 88.) It must, how- 
ever, be remembered that there are again specific poisons 
