202 
PROFESSOR GRAHAM ON OSMOTIC FORCE. 
Table VII. — Chloride of Sodium in Osmometer C of double membrane 
for five hours. 
I. 
II. 
111. 
IV. 
V. 
VI. 
VII. 
Chloride of 
sodium. 
Rise in 
millimeter 
degrees. 
Same in 
grammes of 
water. 
Diffusate of 
salt in 
grammes. 
Previous 
maceration. 
Hydrostatic 
resistance. 
Temperature, 
Fahk. 
per cent. 
0-25 
12 
0-552 
davs. 
2 
min. 
16 
63 
0-25 
8 
0-368 
0-068 
1 
16 
63 
1 
3 
0-138 
0-230 
1 
6 
66 
1 
13 
0-598 
0-242 
1 
8 
66 
2 
11 
0-506 
0-506 
1 
6 
67 
2 
16 
0-736 
0-511 
1 
3 
69 
5 
46 
2-34 
1-513 
2 
3 
72 
5 
51 
2-30 
1-468 
1 
2 
70 
]0 
78 
3-496 
2-994 
1 
15 
67 
10 
82 
3-60 
2-648 
1 
2 
67 
20 
165 
7-36 
6-645 
1 
2 
67 
20 
167 
7-452 . 
6-190 
1 
2 
67 
Chloride of sodium is known to diffuse with nearly double the rapidity of sulphate 
of magnesia in the smaller proportions of salt, and with a still higher velocity in the 
larger proportions of salt ; accordingly the diffusates in the last Table exceed those 
of sulphate of magnesia in a corresponding ratio. The osmose appears pretty uniform, 
but with a tendency to fall below the average rate of the salt in the low propor- 
tions, such as 1 and 2 per cent., and to exceed the same rate in the higher proportions 
of salt. In a septum of single membrane, the osmose of a 10 per cent, solution was 
observed to rise to a high amount. 
Table VIII. — Chloride of Sodium in Osmometer H of single membrane 
for five hours. 
I. 
II. 
III. 
IV. 
V. 
VI. 
VII. 
Salt in 
solution. 
Rise in 
millimeter 
degrees. 
Same in 
grammes of 
water. 
Diffusate of 
salt in 
grammes. 
Previous 
maceration. 
Hydrostatic 
resistance. 
Temperature, 
Fahk. 
per cent. 
dav. 
• 
min. 
2 
21 
1-04 
0-917 
1 
16 
66 
2 
24 
1-20 
0-955 
1 
16 
68 
10 
272 
13-28 
6-502 
1 
16 
68 
10 
311 
15-68 
7-850 
1 
12 
68 
An observation was made on the osmose of a high proportion of salt with another 
single membrane, differing from the last in offering considerably less hydrostatic 
resistance. 
