396 
An actual case of milk adulteration which came under our obser- 
vation at the Hygienic Laboratory will serve to illustrate the different 
phases of this subject. On July 23, 1907, a sample of milk was re- 
ceived from the J amestown Exposition. According to the statement 
of the person submitting the sample, this milk was a sample of the 
milk supplied the guests at one of the tables of a hotel within the 
exposition grounds. This sample of milk gave the following num- 
bers on analysis : 
Specific gravity 
Fat per cent 
Total solids do 
Total solids not fat do 
Ash do 
Milk sugar do 
Refractometer reading 
1. 0213 
1.7 
7.5 
5. 80 
.43 
3. 37 
32. 1 
It was also found to contain formaldehyde and to be artificially 
colored with an azo dye. It was also found to contain a large num- 
ber of bacteria per cubic centimeter. The results of our examination 
of this milk show that the milk was watered. The fact that it con- 
tained a large number of micro-organisms despite the addition of 
formaldehyde indicates either that proper care had not been exer- 
cised in drawing the milk from the cow or that the proper care and 
cleanliness had not been exercised in handling it, or that the attempt 
had been made to keep it for too long a time and probably at too 
high a temperature. Such milk is not only below standard so far as 
food constituents is concerned, but it is exceedingly liable to infec- 
tion, yet this was a sample of the milk probably supplied to many 
persons while they were guests at this hotel. This single instance is 
sufficient to illustrate the real significance of milk adulteration and 
its possible dangers. 
PART V.— THE WASHINGTON MILK SUPPLY. 
So far as our experimental work on this subject is concerned, the 
principal object has been to determine the general character of the 
milk at present supplied to the consumer in Washington and the 
District of Columbia. With this in view, routine chemical analyses 
have been made of milk offered for sale by various milk dealers in 
the city of Washington and the District of Columbia, from the 5th 
of July, 1907, to the 27th of September, 1907, inclusive. So much 
has been written on the subject of the routine analysis of milk, and 
the methods at present employed are generally so well understood, 
that only a few words concerning the methods employed in this 
