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 



26 



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 



100 



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 



75 



79,500 

 83,000 

 88,500 

 84,500 

 63,000 

 83,000 

 82,000 

 79,000 



Samples 3 and 5, 

 40.47 per cent. 





