OSMOTIC PRESSURES DERIVED FROM VAPOUR-PRESSURE MEASUREMENTS. 345 
Table XIV.—a-Methyl Glucoside. 
(1.) 
(2.) 
(3.) 
G-) 
(5.) 
(6.) 
CO 
(8.) 
1 
At 30° C. 
At 0° C. 
Weight 
concentra¬ 
tion. 
lo ge Oo/W- 
s. 
Calculated 
osmotic 
pressure. 
log* po/pi- 
1 
Calculated 
osmotic 
pressure. 
Direct 
osmotic 
pressure. 
35-00 
45-00 
55-00 
64-00 
75 ■ 00 
90-00 
105-00 
0-03592 
0-04731 
0-05930 
0-07011 
0-08352 
0-10241 
0-12144 
1-00260 
1-00186 
1-00087 
0-99956 
0-99881 
0-99721 
0-99507 
atmospheres. 
49-42 
65-14 
81-73 
96-75 
115■34 
141-66 
168-34 
0-03878 
0-05153 
0-06451 
0-07699 
0-09253 
0-11368 
0-13553 
0-99810 
0-99709 
0-99597 
0-99491 
0-99354 
0-99166 
0-98974 
48-29 
64-22 
80 • 50 
96-17 
115-74 
142-46 
170-18 
48-11 
63-96 
81-00 
96-24 
115-92 
56713 gave an osmotic pressure of 44‘05 atmospheres; in neither case was there 
any “ solution leak.’’ Table XV. gives our calcium ferrocyanide results after 
applying Burton’s correction. 
Table XV.—Calcium Ferrocyanide at 0° C. 
Weight 
concentration. 
Calculated 
osmotic pressure. 
Direct 
osmotic pressure. 
31-389 
41-10 
41-22 
39•504 
70--59 
70-84 
42-889 
86-62 e 
87-09 
47-219 
112-97 
112-84 
49-857 
131-33 
131-00 
The results for cane sugar and a-methyl glucoside are plotted against weight 
concentration in Diagrams I. and II. It is interesting to observe that the curves 
at 0° C. and 30° C. for a-methyl glucoside intersect. 
2 z 2 
