BACTERIA IN FOODS l8/ 



77 F. 95 F. 

 2 hours after milking .... (liquefied the 



plate of gelatine) 1,275,000 



6 . . . . 14,620,000 .... 45,900,000 



9 3 6 ,55> 000 57,800,000 



24 13,702,000,000 13,812,500,000 



[Bacteria per cub. inch.] 



These almost incredibly large figures illustrate much the 

 same points, particularly the rapid multiplication at blood- 

 heat, and the later rise at 77 C. 



The Influence of Time is not less marked than that of 

 temperature, as the following table will show : 



Milk drawn at 59 C. = 153,000 m.o. per cub. in. 



After i hour = 616,000 " " 



2 hours = 539,000 " " " 



" 4 " = 680,000 " " " " 



" 7 " = 1,020,000 " " " " 



9 = 2,040,000 



" 24 " = 85,000,000 " " " " 



(Conn.) 



Freudenreich gives another example, as follows : 



Milk drawn at 15.5 C. = 27,000 m.o. per cc. 



After 4 hours = 34,ooo " " " 



9 = 100,000 " " " 



" 24 " = 4,000,000 " " " 



Concerning these figures little comment is necessary. 

 But here again, we may remember that this rapid multipli- 

 cation continues only up to a certain point, after which 

 competition brings about a marked reduction. 



The effect of temperature and time has been illustrated 

 by Dr. Buchanan Young's recent researches, laid before the 



