58 
liACTERIA IN THE AIR— 
1, Nunil>er: 
Sewer air. 
Expired’air. 
Sea air. 
City air. 
('ouiitry air. 
Air in houses, hospitals, ('to. — 
Relation to the sun. 
Relation to habitation. 
Relation to winds and tratli(\ 
Relation to altitude. 
Pa.'^teur’s method. 
Miquel’s method. 
Aeroseopes. 
Frankland’s method. 
' - Petri’s method. 
Hesse’s method, 
Strauss’s method. 
r 2. Varieties. 
3. E.stimation of ammonia in the air. 
\ 
* Estimation of carbon dioxid in the air. 
