LABORATORY COURSE IN FARM DAIRYING. dll 
Exercise No. 12. 
Fermentation test. 
1. Take three pint-jars and clean them thoroughly. Num- 
ber them 1, 2, and 3. 
2. Half fill Nos. 1 and 2 with the same kind of milk; add 
a little pinch of manure or dirt to No. 1. Let them stand at a 
temperature of about 90° F. and closely note the changes that 
take place. To No. 3 add a different kind of milk, and let it 
ferment under the same conditions as above. 
Note the difference in taste, smell, and appearance when they 
have coagulated. 
No. 1 
