90 Report of the Department of Bacteriology of the 



Table II. — Bacterial Counts of Night Milk from Farm A. — continued. 

 Numbers computed for a cubic centimeter. 



* Each clump and each isolated bacterium counted as one; individual bacteria in 

 clumps not counted. 



better to average plate counts of the same number of digits and 

 to compare the averages of the corresponding microscopic counts 

 with these, as is shown in Table III. The ratios were then computed 

 between these averages using the plate count as a basis because it 

 is generally used at the present time as the standard for quantitative 

 bacterial analysis. Comparisons were thus made between the plate 

 counts and the microscopic counts when the total number of indi- 

 vidual bactGria were counted, and between the plate counts and the 

 microscopic counts when the isolated bacteria and clumps were 

 each counted as individual objects. The figures given in the columns 

 which show the clump counts alone were not considered in the ratios 

 because it was felt that there could be no constant relationship 

 between the number of clumps and the plate count, or between the 

 number of clumps and the total number of individual bacteria. 



The milk from Farm A had a comparatively high bacterial content 

 while that from Farms B, C and D contained few bacteria. In fact, 



