THE DETERMINATION OF BACTERIA IN ICE CREAM. 
11 
Table V. — Variation in bacterial content of samples of ice cream taken from the same 
freezer. 
Date samples 
taken. 
Sam- 
ple 
No. 
Number of 
colonies on 
duplicate 
plates (1/1000 
c. c. plated). 
Average 
counts 
per c. c. 
Variation between 
lowest and highest 
counts. 
9-14-14 
1 
2 
3 
4 
5 
6 
7 
8 
9 
48 
66 
48 
60 
46 
51 
61 
52 
42 
56 
47 
46 
43 
56 
50 
52 
48 
44 
52,000 
56,500 
47,000 
51,500 
51,000 
50,500 
56,500 
50,000 
43,000 
Samples 7 and 9, 
31,39 per cent. 
9-15-14 
1 
2 
3 
4 
5 
6 
22 
25 
28 
29 
22 
23 
""24" 
22 
28 
'"'Ml 
22,000 
24,500 
25,000 
28,500 
22,000 
24,500 
Samples 4 and 5, 
29.54 per cent. 
9-16-14 
1 
2 
3 
4 
5 
6 
7 
107 
102 
110 
118 
104 
102 
110 
"'ibb' 
107,000 
102,000 
105,000 
118,000 
104,000 
102,000 
110,000 
Samples 6 and 7, 
7.84 per cent. 
9-17-14 (A) 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
58 
53 
44 
52 
53 
56 
53 
58 
53 
53 
55 
"""52" 
46 
"""53" 
""49" 
56, 500 
53,000 
44,000 
52,000 
52,500 
51,000 
53,000 
55,500 
53,000 
51.000 
Samples 1 and 3, 
28.41 per cent. 
9-17-14 (A) 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
52 
45 
53 
45 
55 
40 
44 
48 
42 
47 
""52* 
57 
""*39" 
48 
51 
50 
47 
52,000 
48,500 
55,000 
45,000 
47,000 
44,000 
47,500 
49,000 
44,500 
47,000 
Samples 3 and 6, 
25 per cent. 
9-18-14 (B) 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
159 
156 
167 
164 
126 
149 
157 
157 
130 
131 
155 
157 
189 
162 
173 
144 
160 
154 
160 
157,000 
156,500 
178,000 
163,000 
149.500 
146,500 
158, 500 
155,500 
145,000 
131,000 
Samples 3 and 10, 
35. 87 per cent. 
9-18-14 (B) 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
186 
157 
158 
179 
166 
185 
178 
165 
148 
168 
160 
""227" 
173,000 
157,000 
192,500 
179,000 
166,000 
185,000 
178,000 
165,000 
148,000 
168,000 
Samples 3 and 9, 
30.07 per cent. 
9-19-14. 
1 
2 
3 
4 
5 
6 
7 
8 
82 
83 
94 
85 
55 
98 
82 
83 
77 
""83" 
84 
71 
68 
....... 
79,500 
83,000 
88,500 
84,500 
63,000 
83,000 
82,000 
79,000 
Samples 3 and 5, 
40.47 per cent. 
