216 MASS. EXPERIMENT STATION BULLETIN 187. 



Table XLII. — Bacteria in Certified Milk from Individual Cows before 

 and after Clarification — Concluded. 



Table XLIII. — Bacteria in Commercial Milk before and after Clarification. 



Sample No. 



Number of 



Bacteria in 



1 Cubic 



Centimeter of 



Unclarified 



Milk. 



Number of 

 Bacteria in 



1 Cubic 



Centimeter 



of Clarified 



Milk. 



Per Cent. 

 Increase. 



1, 



2, 

 3, 

 4, 

 5. 

 6, 

 7, 

 8, 

 9, 

 10, 

 11, 

 12, 

 13, 

 14, 

 15, 



250,000 

 100,000 

 75,000 

 20,000 

 5,000 

 125,000 

 130,000 

 25,000 

 20,000 

 350,000 

 30,000 

 40,000 

 30,000 

 10,000 

 16,000 



900,000 



200,000 

 65,000 

 50,000 

 12,000 

 70,000 



400,000 

 48,000 

 35,000 



250,000 

 40,000 

 50,000 

 20,000 

 10,000 

 33,000 



260 



100 



—13 



150 



14 



—44 



207 



92 



75 



—28 



33 



25 



—33 



106 



The following superficial and provisional conclusions may be drawn 

 from these tables : — 



1. In the case of fresh certified milk about 70 per cent, of the tests give 

 an increase in bacterial content in unclarified milk over the same milk 

 clarified. This leaves 30 per cent, showing an increase after clarification. 



2. In the case of commercial milk about 85 to 90 per cent, show an 



