go RESPONSE IN THE LIVING AND NON-LIVING 
that KHO in minute quantities is an excitant, while in 
large quantities it is a depressant. 
We have thus seen that we may obtain response 
(1) by block method, (2) by the method of injury, or 
relative depression of responsiveness of one contact, 
fa) (6). te. We 

aires ie ee | 
> 
 o— 
r 
1 
1 
Bi io. 
Fic. 54 
P z eens (a) Response when B is treated with 
ST Ug | sodium carbonate——An apparent 
nentyy | ol, yy) a ce acescnaigrts 
Current Response positive variation. — : 
: | (b) Response when B is treated with 
oxalic acid.—An apparent negative 

B treated with so- 
é me Jug variation. ; 
RESO (c) Response when B is treated with 
B treated with ox- very dilute potash.— Positive varia- 
alicacid . . = <= tion. 
(d) Response when B is treated with 
(22 SEER EG strong potash.— Negative variation. 
| dilute potash . => > 
| B treated with The response is up when B is more ex- 
| strong potash . ree <= citable, and down when A is more 
+ae excitable. 
Current of response is always towards Lines thus - ----- indicate deflection due 
the more excitable point. to permanent current. 
and (3) by the method of relative exaltation of 
responsiveness of one contact. In all these cases alike 
we obtain a consistent action current, which in tin 
is normally positive, or towards the relatively more 
excited. 
