174 STORRS AGRICULTURAL EXPERIMENT STATION. 
an average of less than 100,000 bacteria per cubic centimeter; 
group 2 contains those where the bacteria averaged between 
100,000 and 500,000 per cubic centimeter; group 3 contains 
those producers where the bacteria averaged between 500,000 
and 1,000,000 per cubic centimeter; group 4 includes the re- 
sults of those men where the average is between 1,000,000 and 
2,000,000 bacteria, while in group 5 are placed .all those pro- 
ducers whose average was above 2,000,000 bacteria per cubic 
centimeter. 
Discussion of group 1.—This group contains the results ob- 
tained from the milk of those men where the average number 
of bacteria per cubic centimeter is below 100,000 for the whole 
series of tests. The milk of but two producers comes within 
this group. 
In Table 25 it will be seen that the lowest number of 
bacteria which the milk of producer No. 1 contained was 6,830 
while the largest number on any day was 106,300 giving an 
average for the whole series of tests of 61,660 bacteria per 
cubic centimeter. The percentage of acid organisms varied 
from 10 per cent. on November 4 to 51 per cent. on December 
20, the average percentage being 35.7. While the numbers 
of bacteria in this man’s milk are the lowest of any of the 
thirty the insoluble dirt ran compatively high varying from 3 
to 6 in the scale adopted with an average of 4.5. This rela- 
tion between the dirt and the bacteria is an exception to the 
normal condition. It seems doubtful if milk with that amount 
of dirt could be held with so low a number of bacteria without 
the aid of preservatives. This seems especially probable inas- 
much as the temperature of the milk was not below the aver- 
age. The milk was not tested for preservatives and this point 
cannot be definitely stated. With this one exception the milk 
which contained relatively low numbers of bacteria showed also 
relatively small amounts of insoluble dirt. 
In Table 26 it will be seen that the lowest number of 
bacteria found in the milk of producer No. 2 is 6,580 while 
the highest number is 663,750, the average for the whole series 
of tests being 81,650. The percentage of acid bacteria varied 
from o on November 1 to 86 on March 7, with an average of 


