54 
BACTEFwIA lA' WATEF— 
1. Co»IIec-tTiig samples. 
!?. ConiLt nTimber per e. e. : 
< 2 . In tap water. 
K In river water, 
r. In spring water. 
d. In rain water. 
e. In iee. 
3. Species: 
Coli c€ 'mmnnis. 
Typ-iioid. 
Ciiolera. 
I. Organisms in water: 
(•?. Selection. 
h. Isc>lation. 
e, "y nTTib ers- 
5. Estimation O'! organic matter^ — 
a. Free ammonia. 
&. AIEuminoid amme nm. 
6- Estimation o>f nitrates and nitrites. 
7. Est im ation of cMori+is. 
8. Pnriiication of water: 
Heat. 
Filters — 
a. Honsehoid niters. • 
h'. Field and «mnp filters, 
r. Sand filters — 
-\lTim. 
Hyperoxid of elilorin. 
Ozone. 
Permanganate of p^tasli. 
