170 H. S. H. WARDLAW. 
Summary: 
1. The removal of suspended matter from milk by spin- 
ning in acentrifuge does not lower the freezing point of 
the milk. 
2. The rate of deposition of the suspended matter of 
milk in a centrifuge is not constant, first decreasing, then 
increasing. ' 
3. The amount of ash in the deposit shows a variation 
in the opposite direction to that of the rate of deposition, 
first increasing then decreasing; the average ash-content 
of the deposit is 8%. 
4. The pecentages of calcium and of phosphorus in the 
ash of the deposit are not subject to much variation; the 
average values are, CaO 43°1%, P.O; 43°9%. 
). The nitrogen content of the deposit is also fairly con- 
stant; its average value is 11°5% (corresponding to 73 ¥ 
of protein). 
6. The deposit contains about 57% of caseinogen. 
7. No fat is present in the deposit. 
8. The deposit contains about 19% of non-nitrogenous 
organic matter (16% lactose ?). 
9. The average composition of the deposit is thus: ash, 
8%; caseinogen, 57%; other protein, 167%; lactose, 16%; 
other non-nitrogenous organic matter, 3%. 
10. A considerable portion (25-70%) of the deposit is 
soluble in water. The soluble portion contains the bulk 
(up to 90%) of the ash of the deposit. 
In conclusion I wish to express my indebtedness to 
Professor Sir T. Anderson Stuart, in whose laboratory this 
work was done, and to thank Assistant-Professor Chapman 
for his advice and encouragement during the course of 
the work. 
