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COMPARATIVE STUDIES WITH COVERED MILK PAILS 99 








Table 24. 
Gurler Pail with and without cotton and cheese cloth strainer. 
: x Total Acid i fyi 
Date Kind of pail Haier Hacteria Pas paptr ds 
Leo, 64. With strainer 508 96 25 
Pee. oie Waithnout strainer 9,533 8,158 33 
ee With strainer vin iy, 50 8 
PE Te Without strainer 738 sibs: 38 
ey vive With strainer a1 104 4 
ee, Oe. Without strainer 1,563 446 404 
pi sOn With strainer ~ 1,021 158 46 
meen s., Without strainer 783 79 8 
2. ees aA With strainer . 1,065 . 530 25 
emt es Ne Without strainer 1,536 929 4 
SP ee With strainer 1,158 pie rat 
hss es Without strainer 2,500 1,258 30 
Average...| With strainer 824 242 29 
Average..:| Without strainer Pe it 1,830 87 
With strainer. 

Without strainer. 

Difference in favor of strainer. 

drawn through the strainer contained a decidedly lower germ 
content than did the corresponding sample drawn into the pail 
without the strainer. In one case the two samples contained 
practically the same number of bacteria, the number in each 
case being very small while in one experiment decidedly more 
bacteria were found in the milk drawn through the strainer 
than were found in the milk drawn without the strainer. In 
the majority of the tests the difference in the germ content 
is decidedly in favor of the milk which passed through the 
strainer on its way into the pail. The average for the series 
of tests including those where the germ content was against 
the use of the strainer is 824 bacteria per cubic centimeter or 
30 per cent. of the number found in the milk drawn without 
the strainer. This is, of course, a decided difference in favor 
of the use of this form of strainer arrangement. The results 
obtained here are what might be expected since it is always 
difficult for bacteria to pass through a layer of absorbent 
cotton. It is evident that many bacteria are held by the cot- 
ton in this strainer and are therefore excluded from the milk. 
The very low number of bacteria found in the milk in some 
6 
