SPECIFIC ACTION OF NORMAL HUMAN SERUM 
Table II 
Pathogenic. 
SevN 
Milk. 
Mussels. 
Cheese. 
Typhoid from Spleen, j 
Lab. Coli. 
Coli from Appendix. 
Coli from Cystitis. 
Coli from Diarrhoe.i. | 
Q ^ 
C„ 
Co 
Ci 
C„ 
C3 

c 

Coagulation of milk ... 
X 
X 
X 
Gas formation 
X 
X 
X 
X 
X 
X 
X 
Indol ... 
X 
X 
Marked growth on potato 
Human typhoid serum at dil. 
I-20 
X 
Human normal serum at dil. 
I-20 
X 
X 
Normal rabbit serum at dil. of 
I-+0 ... ... 
Serum of typhoid injected 
rabbit at dil. of 1-40 
Serum of coli injected rabbit at 
dil. of 1-40 
X 
colon bacillus. Such animals injected with typhoid cultures ought (supposing a strict specific 
action) to give a serum agglutinating the typhoid bacillus and not the colon bacillus. 
In Table II it will be seen that on none of tlie coli-like organisms had the serum of a 
typhoid rabbit (in dilution) any action, whilst it had a marked action on typhoid bacilli. So tliat, 
presumably, the results of those observers who have used tlie sera ot injected animals as the 
differentiating agent have escaped the above-mentioned error. 
However, even if injected animals be used, the serum ought to be proved to have no action 
upon the colon bacillus in the dilution at which it is proposed to use it as a differentiating test. 
