159 
_ NATURE OF DEPOSIT OBTAINED FROM MILK. 
porcelain dish with water, evaporating to dryness over a 
water bath, and drying to minimal weight in an air oven 
at 100° C. It was not found possible to get the deposits 
to constant weight, as the weight after decreasing for a 
time then began to increase. The heating was therefore 
continued until this increase of weight began, the minimal 
weight being taken as the weight of the dry deposit. Even 
at the temperature of the water bath these deposits became 
quite brown. The following table shows the weights 
of deposit obtained after spinning the milk for various 
periods and the rate of accumulation of the deposit over 
these periods. The rate of deposition is expressed in 
milligrams per minute per 100 cc. of milk. 
Table I1Il.— Rate of Accumulation ete. of Deposit from Milk. 
Milk.| Volume. | Time Spun. aces iG Increment. De on 
19 | 400 ce. 30 min. | 0°2568 gm. we 2°140 
b20 ts 0-6975 ,, |0°4407 om.) 1-224 
ESO « MOM e,; p) O31. 50-.,, 1°321 
ZO =, rengOOL =, -LO-Li ia. 5, 1°521 
22 | 400 cc. 60 min. | 0:2700 gm. ih 1:125 
Io. =. 0:5208 ,, |0°2508 gm. 0°838 
Roo” O09) ., | O2051) 0°854 
225 ,, C2205. | Ocb7 56, 1°462 
23 | 400 cc. 60 min. | 0:2933 gm. ao 1-222 
too ~ 05787 ,, | 0°2854 gm.| 0-792 
ZG. > O47 tO 25S 2 0:898 
AG Vee EOUG2 FF O-20710" | 1:026 
24 | 300 cc. 60 min. | 0°2642 gm. ae 1°468 
120 ,, | 0°4264 ,, |0:1604 gm. 0-892 
ToC | Oconee eer Oa 5: ,. 0-859 
ZAP ee On aee we  O-1G92  ,. C2307 
This table shows that there are considerable variations 
in the rates at which the deposits fall in different milks. 
Other factors being equal, this points to a difference in the 
size of the suspended particles in different milks. It will 
