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WISCONSIN STATE AGRICULTURAL SOCIETY. 
ment with the hydrometer. Each factory is also provided 
with a set of small glass tubes, upon which the names of the 
patrons are pasted. As milk is delivered a small sample is 
placed in the different tubes corresponding with the name of 
the patron, and set aside. If the milk is not all right, the hy¬ 
drometer and these samples give warning; the milk is then 
subjected to a more careful test, by the use of the cream guages 
and per cent, glass, which are represented in the following fig¬ 
ures. 
Instruments for Testinq Milk. 
Fig. 27. 
Fig. 29. 
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