COMPARATIVE STUDIES WITH COVERED MILK PAILS 85 
in these samples of milk are quite low owing to the good 
condition of the stables. The samples from the covered pail, 
however, contain on an average only about 17 per cent. of the 
bacteria found in the milk from the open pail. In other words, 
the open pail allowed practically six times as many bacteria 
to fall into the milk as did the covered pail. In the diagram 
accompanying Table 19 these average differences are repre- 
sented by the relative length of the straight lines. 
After making these tests in the College barn_ the writer 
wished to determine the value of the covered pail in stables 
where the conditions of cleanliness were not quite so good as 
those maintained in this stable. Through the kindness of the 
owners it has been possible to make such tests in two other 
stables. One of these stables is shown in Fig. 29. 
This is a basement stable opening to the southeast with a 
good abundance of windows. The stable floor is made of 
plank sufficiently raised from the walk behind to insure the 
cleanliness of the cows. The general construction of the 
stables is fairly good and the cows received considerable care 
so that they were entirely free from any adhering filth and 

Fic. 29—Photograph showing stable where experiments given in 
table 20 were made. Conditions of cleanliness not quite so 
good as in College stable. -(Photograph by Jarvis.) 
