42 



BULLETIN 642, U. S. DEPARTMENT OF AGRICULTURE. 



duction of the essential factors was noted on farm 27, where the 

 average count was reduced from 186.995 to 3,606 bacteria per cubic 

 centimeter. On farm 178 the average number of bacteria in the 

 cream was reduced from 49,181 to 3,025 per cubic centimeter : all the 

 separator parts were sterilized in the simple steam sterilizer and held 

 in it until ready for use. 



Table 18. — Bacteria per cubic centimeter in daily samples of mill: (5 farms) and 

 cream < 1 farm), shotting effect of using small-top pails and sterilized utensils. 





Open pails, uten- 



Small -top pails, 





Open pails, uten- 



Small-top palls- 

 utensils sterilized 



Farm 



sils not sterilized 



utensils sterilized 



Farm 



sils not sterilized 



No. 



(3 weeks, July 23 



(3 weeks, Aug. 15 



Xo. 



(3 -weeks, July 23 



(3 weeks, Aug. 15 





to Aug. 12). 



to Sept. 2). 





to Aug. 12). 



to Sept. 2). 



1 



233,000 



3.500 



29 



' 80. 000 



1.200 





81.000 



2.700 





109.000 



600 





103.000 



51.300 





65.000 



1.700 





176.000 



8.500 





8.000 



1.100 





67.000 



3.200 





16.200 



900 





220.000 



4.100 





80.000 



3.1.50 





17.300 



4.500 





8.500 



2.800 





139. 000 



10.000 





25. 300 



1.300 





15. 200 



4.100 





302.000 



1.700 





16,900 



5.000 





19.000 



1.750 





28.500 



30,000 





400.000 



1.300 





49.000 



10,000 





30.000 



2.200 





212.000 



7.600 





44.800 



1.100 





49.000 



9.000 





6.000 



7.000 





88.000 



10. 800 





140.000 



2.300 





32,300 



5,900 





11.000 



1,300 





600.000 







100.000 







12.600 







10.600 







71.000 







9.400 







Average of 19 sam- 



Average of 16 sam- 



Average of 19 sam- 



Average of 16 sam- 





ples, 116,384. 



ples, 10, 637. 



43 



ples, 77,095. 



ples,-l,962. 



20 



10.300 



3,100 



4.200 



1.100 





143. 000 



800 





70.000 



900 





7.000 



5.400 





320.000 



2.000 





5.800 



2,900 





64.000 



1.700 





12.000 



700 





6.600 



2.700 





1.200 



3,800 





2.000 



5.600 





5.300 



3,300 





9.700 



1.700 





17.400 



4.500 





2.600 



5.600 





3.300 



2.700 





6.000 



2.550 





3.200 



2.550 





6,000 



2.050 





5,400 



2.0.50 





16.000 



2.200 





6.200 



26.100 





30.000 



1.700 





20.000 



2,800 





64.000 



1.600 





9.700 



2,700 





11.400 



1.100 





5,000 



800 





3,600 



1,000 





6.700 



10, 300 





4.600 



900 





5.200 







4,000 







4,200 







2,800 







Average of 18 sam- 



Average of 16 sam- 



Average of 18 sam- 



Average of 16 sam- 





ples, 15,050. 



ples, 4,656. 





ples, 34,861. 

 Average of 93 sam- 

 ples, 87,391. . 



ples, 2,150. 

 Average of 80 sam- 

 ples, 4,602. 



27 



420.000 

 134,000 

 91.000 



2.300 

 1,600 

 3,100 







178 



12.000 



2,100 





47.000 



2.400 



(cream). 



6.000 



100 





155.000 



1.400 





52,000 



2.200 





93.000 



4.000 





15.000 



1.300 





77.000 



1.900 





2,400 



4.200 





188,000 



1,800 





15. 500 



2.250 





118.000 



1,800 





17,400 



3.400 





102,000 



24.000 





3.200 



3. 700 





44.200 



2.300 





7.200 



10. 000 





406.000 



1.500 





24.700 



750 





140.000 



2,800 





3.5,700 



2.000 





1,140,000 



2.500 





94.000 



3.600 





92,000 



2.000 





300.000 



2.600 





34.400 



2,300 





8,000 



2.400 





13.300 







173. 000 



3.300 





105.000 







20.800 



4.500 





153, 000 

























Average of 16 sam- 



Average of 16 sam- 











Average of 19 sam- 



Average of 16 sam- 





ples, 49,181. 



ples, 3,025. 





ples, 186,995. 



ples, 3,606. 





















