130 The Philippine Journal of Science 
TABLE 1V.—Same arrangement as Table III. 

Enrichment. 

Growth on plates. 


Medium. Reaction. 
Lactose 
agar. 
Dieudon- 
né’s agar. 
= 
Remarks. 

+2 
+1.5 
aul 
+0.5 
—!! 
—1.5 
= 
+2 
+1.5 
shal 
+0.5 
ll 
el is) 
= 






> 
Reaction +2 exclusively red colonies. 
Red colonies decrease toward the alka- 
line end of the series butare still present 
on the plate made from peptone —1. 5. 
From +2to—0.5 cholera pure; from —1 to 
—2 besides cholera colonies also small 
yellowish colonies present. Their num- 
ber increases with increasing alkalinity 
of peptone. | 

TABLE V.—Same arrangement as Table IV. 

[ Enrichment. 
Growth on plates. 

Medium. Reaction. 
Lactose 
agar. 
Dieudon- 
né’s agar.| 

+2 
+15 
+0,5 





Remarks. 
Exclusively red colonies in +2. Morered 
colonies than cholera in —0.5. On —2 
plate mostly cholera colonies; only very 
few red colonies. No blue colonies ex- 
cept cholera. 
Pure cholera. Cholera colonies most 
numerous from —0.5 to 1.5 reaction. 

1915 
