MILKING MACHINES Meg 
jority of cases the machine drawn milk kept longer than the 
_ milk which was drawn by hand. While this was not always 
true, it was so in most cases, even when the germ content of 
the milk was as high or higher than that of the hand drawn 
milk. This is illustrated in Table 35 where the average germ 
content of the machine drawn milk was 55,000 and the hand 
drawn milk 5,900 bacteria per cubic centimeter. In spite of 
this, the machine drawn samples kept on an average of 59 
hours before they curdled, while the hand drawn milk aver- 
aged but 48 hours. A similar relation is shown in Tables 
32 and 34. 
The greatest difference in the keeping quality is shown 
in Table 33 where the cotton filters were used and the germ 
content of the machine milk averaged much lower than that of 
the hand milk. In this series of experiments, while the milk 
drawn by hand curdled on an average of 36 hours, that drawn 
by machine kept 72 hours before curdling. 
