THE ALCOHOL TEST IN EELATIOST TO MILK. 



19 



of great importance we have ex amin ed a number of samples of market 

 milk which had been held for a number of days. 



In Table 15 are shown the results of the examination of four samples 

 of market milk. One was raw milk and the others were pasteurized. 

 Each bottle of milk was obtained from a different dairy and was held 

 in a refrigerator at a temperature of about 9° C. The acidity and 

 alcohol test were determined daily and bacterial counts were made on 

 the first day and again when the 68 per cent alcohol gave a positive test. 



It is evident from the results obtained that the alcohol test (68 per 

 cent) does not show the freshness of milk. The samples were held 

 from 8 to 13 days at 9° C. before the alcohol test became positive, and 

 during that time the bacteria had increased to more than 100,000,000 

 per cubic centimeter. 



Table 15. — -Effect on the alcohol test of holding milk at 9° C. 



Days 

 held. 



Raw milk. 



Pasteurized milk A. 



Acid- 

 ity. 



Alcohol test. 



Bacteria 



per cubic 



centimeter. 



Acid- 

 ity. 



Alcohol test. 



Bacteria 

 per cubic 

 centimeter. 



75 

 per 

 cent. 



68 

 per 



cent. 



44 

 per 



cent. 



75 

 per 



cent. 



68 

 per 



cent. 



44 

 per 



cent. 







1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



1.72 



i+V.S. 

 +V. S. 

 +V. S. 

 +V.S. 



— 



= 



8,200 





- 



= 



— 



37,000 





















1.88 

 1.95 

 2.02 



+v. s. 



+v. s. 



- 



= 







+s. 



+S. 



— 



- 



















1.78 

 1.88 

 1.93 

















2.08 

 2.43 

 2.72 



+ M. 

 + L. 

 + L. 



+M. 

 + L. 



- 





2.30 

 2.48 

 2.75 



+ L. 

 +L. 

 + L. 



+M. 

 +L. 

 +L. 



+ L. 



242,000,000 





146,000,000 



626,000,000 



Days 

 held. 



Pasteurized milk B. 





Pasteurized 



milkC. 



Acid- 

 ity. 



Alcohol test. 



Bacteria 



per cubic 



centimeter. 



Acid- 

 ity. 



Alcohol test. 



Bacteria 



per cubic 



centimeter. 



75 

 per 

 cent. 



68 

 per 

 cent. 



44 

 per 



cent. 



75 

 per 

 cent. 



68 

 per 



cent. 



44 

 per 



cent. 





 1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 

 12 

 13 

 14 



1.74 



+M. 

 + L. 

 +M. 



+M. 



- 



- 



182,000 









- 



— 



133,000 





1.75 















1.88 



2.00 

 2.10 

 2.38 



+M. 

 +M. 

 +M. 

 +M. 

 +M. 

 + L. 



+M. 

 +M. 

 + L. 



— 







+M. 

 + L. 

 + L. 



+M. 

 + L. 

 + L. 



+M. 

















145,000,000 



2.12 

 2.34 



2.77 



221,000,000 





650,000,000 





2.45 



+ L. 



+ L. 



+M. 



700,000,000 































































1 See footnote under Table 1. 



