PROPERTIES OF FISH AND VEGETABEE OIE MIXTURES. 19I 
density. 
There is little to be said in regard to the data furnished by specific gravity determi- 
nations. These were made by use of the Ostwald pycnometer. The results are given in 
table vm and shown by graphs in figures 4 and 5. Figure 4 shows that the densities 
Z.9 
Zf 
ZJ 
/.7 
0.9 
OS 
ZS JO 7S 
Fig. 3. — Fluidity curves, 30°. 
£ 
- 
S 
4 
ft 
t/7 
J/ 
f\y 
V 
y 
0 / 
" 
perce/7/ 
are linear functions of the temperature over the range at which we worked, except with 
the China-wood oil, the composition of which changes on heating. Linseed and dogfish- 
liver oil mixtures have additive densities at 30° while the other mixtures do not. This 
data was of value to us principally in our calculation of the viscosities. 
