REPORT OF BACTERIOLOGICAL EXAMINATIONS 185 
MILK ANALYSES FOR THE YEAR 
The total number of milks examined was five hundred and sixty. These 
were examined for the presence of : — 
1. The Bacillus tuberculosis 
2. The Bacillus coli 
3. The Bacillus enteritidis sporogenes 
4. Other bacteria 
The Bacillus tuberculosis indicates that the animal from which the milk was 
taken was tubercular, or that the pails into which the milk was received, or the hands 
of the milker, were infected from previous contact with a diseased cow. 
The Bacillus coli indicates contamination with dirt, of an intestinal origin, or 
possibly that the cow was suffering from inflammation of the udder. 
The Bacillus enteritidis sporogenes indicates dust or intestinal contamination. 
Presence of the Tubercle Bacillus 
Of the five hundred and sixty samples examined for tubercle, one hundred 
and five guinea pigs died before the tubercular test was completed, leaving four 
hundred and fifty-five samples for the completion of the investigation. Of this 
number nine proved tubercular^ five were found in railway borne milks, and four in 
town milks. 
The greater frequency of tubercle in railway- borne milks was also noted last 
year. It is a very serious matter that tubercle is still so wide-spread in milk. When 
it is remembered that one tubercular cow may be the means of infecting the milking 
utensils, the hands of the milker, and even the teats of the other healthy animals, 
regulations to deal with infected animals cannot be too stringent. 
Presence of the Bacillus enteritidis sporogenes and the Bacillus coli 
The Bacillus enteritidis sporogenes was found twenty-six times in two 
hundred and fifty-five town samples of milk, and forty-two times in three hundred 
and five railway-borne samples. 
The Bacillus coli was present fifteen times in the town milks, and forty times 
in the railway milks. 
This is an exceedingly interesting and important result, for it shows that less 
care is taken in handling the country milk, and, therefore, that contamination much 
more frequently occurs. Bacillus enteritidis sporogenes appears most common in 
March and April ; Bacillus coli in November and December. 
In the case of the railway-borne milk, the Bacillus coli was most abundant in 
December, and this may indicate that, in addition to dirt contamination, a possible 
other source of the coli was inflammation of the udder. 
Y 
