13 
The re-agents are in the order of their "stimulation effi- 
ciencies." 
Table of Stimulation Efficiencies. 
Velocity of Ration 
Velocity of Anion 
Stiniul&tion 
Substance. 
in Centimetres 
per Second. 
in Centimetres 1 
per Second. 
Efficiency. 
H.,SO, 
320 X 10-» 
45 X 10-^ 
-h -SI 5 
HCl 
320 X 10-^ 
53 X 10-5 
+ -716 
HXO, 
320 X lO-"^ 
64 X 10-5 
+ -667 
K0CO3 
— 
— 
+ -547 
K,80, 
66 X 10-^ 
45 X 10-5 
+ -392 
Xa.CO, 
— 
— 
+ "289 
NaoSO^ 
45 X 10-^ 
45 X 10-5 
+ -250 
KCl 
66 X 10-5 
53 X 10-^ 
+ -109 
KI 
66 X 10-5 
60 X 10-5 
+ -048 
KNO. 
66 X 10-5 
64 X 10-5 
+ -015 
XaCl 
45 X 10-'' 
53 X 10-' 
- -082 
CuSO, 
31 X 10-^ 
45 X 10-5 
- -092 
AgNO, 
49 X 10-5 
64 X 10-5 
- -133 
IS^al 
45 X 10-5 
60 X 10-5 
- -143 
NaXO.., 
45 X 10-5 
64 X 10-5 
- -174 
LiCl 
36 X 10-5 
53 X 10-5 
- -191 
Bad., 
39 X 10-5 
53 X 10-5 
- -364 
CaCl, 
35 X 10-5 
53 X 10-5 
- -403 
CuCU 
31 X 10-5 
53 X 10-5 
- -446 
KOH 
66 X 10-5 
182 X 10-5 
- -468 
MgCL 
— 
- -517 
NaOH 
45 X 10-5 
182 X 10-5 
- -604 
LiOH 
36 X 10-5 
182 X 10-5 
- -670 
Ba(OH)o ... 
39 X 10-- 
182 X 10-5 
- -735 
Ca(OH). ... 
35 X 10-5 
182 X 10-5 
- -758 
The third decimal place in the column of stimulation effi- 
ciencies is the nearest approximation. 
To test the conclusions arrived at in this section, it is 
necessary to ascertain the state, "positive" or "negative," of 
the organism, and then to test its re-actions to various re- 
agents, and to the constant current, under the same condi- 
tions. 
Tliis appears not to have been done hitherto. H. H. 
Dale, it is true, has made investigations of this nature,"^ but 
he nearly always uses acetic acid in his media or in lur> Icrt 
* Journal of Physiologj^ 1901. vol. xxvi., page 291. 
