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MILKING MACHINES 119 

Hic. 42b; 
By rinsing the tubes with 50 cubic centimeters of sterile water 
it was found that this rinse water commonly contained several 
thousand bacteria per cubic centimeter. Photographs of two 
of the plates made from this rinse water may be seen in Fig. 
42. It was found that the brine itself increased in germ 
content very rapidly from day to day. At three days old, it 
contained from one to two thousand bacteria per cubic centi- 
meter (see Fig. 43) and at ten days, it contained very high 
numbers, including many liquifying organisms. It was evi- 
dent from the results of these experiments that the brine treat- 
ment is not satisfactory for keeping the tubes sterile. 
