CHAPTER IV 
THE BACTERIAL TEST 
THE LABORATORY 
TestTiInG milk for bacteria does not require 
the services of a college professor nor a lab- 
oratory equipped with expensive apparatus. 
Any boy or girl with a high school education 
can learn how to make tests of milk for the num- 
bers of bacteria by the ‘“‘plate method” after 
six weeks’ training. The laboratory operations 
are simple and very easy to understand. Accu- 
racy and speed are necessary to make such tests 
available for the milk industry and for health 
authorities. 
When such testing was done only in expen- 
sive laboratories by college professors the cost 
was too great to make such testing available 
for milk dealers and dairy farmers and the health 
authorities of small cities. , 
But at the present time bacterial tests of milk 
can be made by every milk dealer and by every 
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