668 
the physics of fluids, the top layers of the milk are sometimes not as 
hot as the bottom or require a much longer time to heat up. 
Experiment No. 1. 
Pint mixed market milk. 
Bottle immersed in water to its lip. 
Distinct cream line from standing over six hours before heating ; thick cream, 
almost butter, floating on top. 
i Water 
) temper- 
! ature. 
Milk temperature. 
Time. 
Colonies 
per loop 
in agar. ; 
Remarks, 
Top. 
Bottom. 
°C. 
26 
°C. 
26.5 
°c. ! 
25.5 
Minutes. 
(“) 
30 
26.5 
26.5 
2 
( a ) 
40 
27 
28.75 
4£ 
(°) 
50 
30 
32 
7 
(«) 
60 
35 
39 
94 
( a ) 
70 
' 41 
45 
12 
( a ) 
75 
45 
49 
13 
(“> 
80 
50 
53.5 
141 
(«) 
83 
! Simmering. 
85 
55 
58 
154 
(«) 
87 
58 
60.5 
16i 
( & ) 
88 ! 
60 
62.5 1 
16f 
(*) 
91 1 
63 
66 
174 
( 6 ) 
92.5 
65 
68 
184 
( 6 ) 
97 j 
70 
73 
194 
D) 
98 
71 
75 
20 
( c ) 
Boiling. 
100 
75 ] 
80 
214 
( c ) 
100 
78 1 
83 
23 
( c ) 
100 
80 
85 
234 
W 
« Innumerable,. c Distinctly less innumerable. 
6 Somewhat less innumerable. d About 200,000. 
Experiment No. 2. 
Pint mixed market milk. 
Bottle immersed in water 6 inches, 1 inch out. 
Water ! 
temper- 
ature. j 
Milk temperature. ! 
Colonies 
per loop 
in agar. 
Top. 
, lime. 
Bottom. 
°C. 
' 
°c. 
°C. \ Minutes. 
28 
14 
9,000 
60 
32 
5 
70 
40 
80 
48 
9 
85 
50 
10 
8,000 
90 
55 
!. ii 
4,000 
94 
60 
. 12 
750 
98 
65 
124 
600 
100 
70 
13 
80 
