470 
Table No. 20. — Milk from healthy cow {No. 2) inoculated 2 hours after milking. 
[24-hour culture used in each case.] 
Colonies 
per loop 
at once 
after 
inocu- 
lation. 
Colonies per loop after 
10 hours at 37° C. 
Shaken. 
Vigorously 
agitated." 
B. typhosus in raw milk untreated 
1,070 
1,960 
4,300 
B. typhosus in milk heated to 55° C. 30 minutes 
1,350 
2,400 
17, 820 
B typhosus in milk heated to 65° C. 30 minutes 
960 
13. 000 
(°) 
12.000 
B typhosus in milk boiled 1 minute . . . 
1,150 
820 
B. lactis aerogenes in raw milk untreated ' 
15, 000 
B. lactis aerogenes in milk heated to 55° C. 30 minutes 
1,500 
400 
950 
(“) 
(«) 
(a) 
18 
B. lactis aerogenes in milk heated to 65° C. 30 minutes -. 
B. lactis aerogenes in milk boiled 1 minute 
Original milk 
2 
Table 21. — Milk from healthy cow {No.- 2) inoculated 3 hours after milking. 
[24-hour agar culture used in each case.] 
Bacteria 
per loop 
at once 
after 
inocu- 
lation. 
Bacteria per loop after 
9 hours at 37° C. 
Shaken. 
Vigorously 
agitated. 
B. typhosus in whole raw milk 
B. typhosus in whole milk heated to 60° C. 20 minutes 
B. typhosus in sterilized milk (control) 
B. lactis aerogenes in whole raw milk 
B. lactis aerogenes in milk heated to 60° C. 20 minutes. 
B. lactis aerogenes in sterilized milk (control) 
Original milk. 
6.500 
10,000 
9.000 
5,300 
7.000 
7.500 
48 
2, 300 
3,400 
a b 200,000 
325 
11,000 
a b 150, 000 
73 
14, 000 
1,700 
a Innumerable. 
b About. 
