Neos 167 
IL Mire. 
The analyses of milk, made at the station, have included the follow- 
ing determinations : | 
‘Specific gravity. 
Cream. 
Solids. 
Fat. 
. Albuminoids (casein and albumen). 
Sugar. 
. Ash. é 
The milk to be examined is thoroughly mixed by pouring, several 
times, from one vessel to another before taking samples for analysis. 
The portions taken for the solids, fat, albuminoids and ash are 
weighed ; that taken for the sugar is measured. The milk may be 
weighed in a small dropping bottle, but more conveniently in a pipette 
with a bulb ten to twelve centimeters long, holding about fifteen 
c. c., with marks to indicate five c. c. and tenc.c. The stem of the 
pipette is a tube with thick walls and about one mm. bore. On the 
end of the stem is slipped a rubber tube containing a small glass ball 
/ that completely closes it and acts as a valve. By pinching the rubber 
. tube at the side of the ball a channel is formed which admits the air 
and gives complete control of the flow of liquid from the pipette. 
The pipette is filled by attaching a short glass tube to the end of the 
rubber, opening the valve and applying suction in the usual way. 
When filled to the mark the pipette is wiped dry with filter-paper and 
_ the rubber tube moved sufficiently to withdraw the liquid from the 
e point. The pipette and milk can then be weighed without danger of 
» . loss. 
The analysis is conducted as follows : 
IOP ww 
1. Specific gravity. 
The specific gravity may be most accurately determined with the 
pipette described above, by finding the weight of distilled water at 
15° C:, which the pipette holds when filled to the mark. The weight 
of milk which the pipette contains divided by the weight of water 
- gives the specific gravity very accurately. Care must be taken to bring 
the temperature of the milk to 15° C. before weighing. 
In the analyses given, the specific gravity has, in all cases, been 
taken with a delicate hydrometer, the scale of which admits of read- 
ing to ten-thousandths. The reading corrected for temperature gives 
results which are accurate to the third decimal. 
2. Oream. 
A glass cylinder 2.5 centimeters in diameter and about 20 centi- 
meters high, graduated in cubic centimeters, is filled to the 100 c. ¢. 
mark with milk and set aside fifteen hours, the temperature being 
about 15° C. The number of divisions occupied by the cream is 
easily read off and gives the per cent by volume. 
f: 3. Solids. 
About two grams of rather coarse asbestos are placed in a platinum 
' evaporator of 30 c. c. capacity, ignited and weighed. Five c. c. of 
milk from the pipette, previously weighed, is run into the evaporator 
“male 
