SIGNIFICANCE OF COLON COUNT IN MILK. 

 Table 5. — Colon count from milk -produced under clean conditions. 



11 



Sample No. 



Total 

 count. 



Colon count. 



Fresh. 



After 24 hours 

 at 70° F. 

 (21.1° C). 



1 



2 



Per c. c. 

 6,200 

 6,200 

 8,900 

 5,100 

 3,900 

 5,400 

 3,600 

 2,200 

 6,500 

 4,600 

 6,300 

 3,300 

 4,700 

 1,130 

 2,270 

 5,300 



Per 1J10 c. c. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



Per c. c. 



12,000 

 5,000 



16,000 



9,000 



125,000 



51,000 



24,000 



900 



3,300 



88,000 



6,000 



54,000 



35,000 



303,000 



291,000 



83,000 



3 



4 



5 



6 



7 



8 



9 



10 



11.. 



12 



13 



14 



15 



16 





Further examination was made of 14 samples of certified milk as 

 shown in Table 6. According to this table only 7 of the 14 samples 

 showed the presence of colon organisms in 1 cubic centimeter • of 

 fresh milk, as determined in lactose-broth tubes ; but after 24 hours 

 they were found in every sample. These results, together with those 

 of other investigators, clearly indicate that milk as commercially 

 produced under the most careful conditions is never entirely free 

 from organisms of the colon-aerogenes group. 



Table 6. — Colon count from certified milk. 



Sample No. 



Total 



count in 



milk as 



delivered. 



Colon count. 



Fresh. 



Held 24 hours at— 



Held 48 hours at — 



60° F. 

 (15.6°C.). 



70° F. 

 (21.1° C). 



60° F. 

 (15.6° C). 



70° F. 

 (21.1° C). 



1 



Per c. c. 



7,400 

 10,400 



5,200 

 10, 100 



8,200 



4,200 

 12, 600 



5,900 

 14, 800 

 11,400 

 10, 100 

 22, 800 



7,800 

 15, 700 



Per c. c. 

 10 

 i 1 

 i 1 

 20 

 

 i 1 

 10 



11 





 

 

 

 

 



Per c. c. 



10 

 110 



10 

 280 

 100 

 170 

 320 



20 











460 



10 



20 

 150 



Per c. c. 

 4,600 



38,000 

 2,900 



79, 000 

 400 



16, 600 



13,500 



1,800 



3,100 



400 



38,000 

 1,100 

 6,500 

 5,800 



Per c. c. 



23,700 



49, 000 



46-000 



55, 000 



1 900 



120,000 



169,000 



21,600 



2,700 



4,600 



186.000 



6,400 



10. 800 



36,000 



Per c. c. 

 4,400,000 



15,000.000 

 2,890,000 



16,400,000 

 1, 130, 000 

 6,100.000 



12,500,000 



560, 000 



610, 000 



5,300,000 



13,100,000 

 3,700.000 

 8,700,000 

 1,510,000 



2 



3 



4 





6 



7 



8 



9 



10 



11 



12 



13 



14 



Average. 



10, 471 





119 



15, 121 



52,336 6.564.286 









1 1 means at least 1 per cubic centimeter. 



