8 BULLETIN 563, U. S. DEPARTMENT OF AGRICULTURE. 
Table II. — Variation in bacterial content of 9 duplicate samples from each of twenty-two \ 
1-gallon lots of commercial ice cream. 
Plant 
No. 
Lot. 
Flavor. 
Bacteria per cubic 
centimeter. 
Varia- 
tion in 
bacterial 
count. 
Minimum. 
Maximum. 
1 
Vanilla 
Chocolate . . . 
Peach 
Vanilla 
Vanilla 
2,085,000 
445, 000 
1,460,000 
20,000 
7,150 
2,530,000 
585, 000 
1,600,000 
80,000 
13,000 
Per cent. 
21.34 
31.46 
9.59 
300.00 
81.81 
B 
C 
D 
E 
2 
A 
Vanilla 
Chocolate . . . 
Vanilla 
43, 500, 000 
180, 500, 000 
60.000.000 
61,000,000 
225,000,000 
75.000.000 
40.23 
24.65 
25.00 
B 
C (fat, 9.6 per cent) 
I 1 
3 
• 
A (fat, 9.6 per cent) 
| 
Vanilla | 251,500 
Peach 1 192,000 
Chocolate... 1 
307,000 
221,000 
1.235.000 
22.31 
15.10 
26.66 
B 
C 
4 
A (fat 22 5 per cent) . 
Vanilla 
Peach 
Chocolate . . . 
27,000,000 
28,750,000 
28,000,000 
33,750,000 
47,000,000 
33,000,000 
25.00 
63.47 
17.85 
B 
C 
5 
Vanilla 
Peach 
Chocolate . . . 
335,000 
410,000 
122,000,000 
490,000 
500,000 
160,500,000 
46.27 
21.95 
31.55 
B 
C 
6 
A (fat, 9.2 per cent) 
Vanilla 
Peach 
Chocolate . . . 
Vanilla 
13, 150, 000 
97,000,000 
37,000,000 
1,055,000 
27.000,000 
116', 000, 000 
46,500,000 
1,415,000 
105. 32 
19.59 
25.67 
34.12 
B 
C 
D 
7 
A 
Chocolate . . . 
1,310,000 
1,770,000 
35.11 
VARIATION WHEN HELD IN AN ICE-CREAM CABINET. 
It was thought that there might be an uneven distribution of 
bacteria in ice cream held in an ice-cream cabinet w T here it is allowed 
to soften, then is repacked with ice and salt and again hardened. 
To determine this point, three 1-gallon lots of ice cream were pur- 
chased from three different manufacturers and held for 11 days in a 
commercial ice-cream cabinet, such as is used in stores. 
The ice cream was packed with ice and salt once a day in the 
regular way. From day to day it softened and again hardened. 
In Table III it may be seen that even under this extreme condition 
the highest variation among the samples from each lot was only 
37.03 per cent. In this case the lowest count was 1,080,000 and the 
highest 1,420,000 per cubic centimeter. 
