826 
PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
Diffusion of Nitrate of Soda in seven days at 63°'4 ; two cells. 
From solution of 2 per cent. . 
Grs. 
. . 12*35 
Ratio. 
2 
From solution of 4 per cent. . 
. . 23*56 
3*82 
From solution of 8 per cent. . 
. . 47*74 
7*73 
The ratios of the last column of the preceding Table are sensibly the same as those 
already obtained for nitrate of silver. But the diffusibility of nitrate of soda appears 
to be increased less rapidly by temperature than nitrate of silver. Hence the diffusi- 
bility of these two salts appears more similar at low than high temperatures. 
Diffusion from 2 per cent, solutions in seven days at 53°. 
Nitrate of silver .... 1T24 100 
Nitrate of soda .... 10'81 96T7 
Diffusion from 2 per cent, solutions in seven days at 63°'4. 
Nitrate of silver .... 13‘61 100 
Nitrate of soda .... 12‘35 90'74 
32. Chloride of Sodium. 
Time of diffusion seven days. The salt diffused was treated with nitrate of silver, 
and the chloride of silver weighed. 
1. Chloride of sodium, 1 per cent. Diffused at 50°‘5, in eight cells, 5’96, 5’69, 5'54, 
5‘50 ; mean 5'70 grs. of chloride of sodium for two cells. 
2. Chloride of sodium, 0’985 per cent. Diffused at 53°'4, in eight cells, 5‘86, 5*86, 
5’77, 5*76 ; mean 5‘81 grs. for two cells ; calculated for 1 per cent., 5*89 grs. at 53°-4 
for two cells. 
3. Chloride of sodium, 1 per cent. ; density 1*00776. Diffused at 63°*4, in eight 
cells, 6*30, 6*18, 6*52, 6*30 ; mean 6*32 grs. for two cells. 
4. Chloride of sodium, 2 per cent.; density 1*01483. Diffused at 63°*4, in eight 
cells, 12*37, 12*08, 12*45, 12*53 ; mean 12*37 grs. for two cells. 
5. Chloride of sodium, 4 per cent. ; density 1*02879. Diffused at 63°*4, in four cells, 
12*56, 12*65, 12*55, 12*17 ; mean 12*48 grs. for one cell. 
6. Chloride of sodium, 8 percent.; density 1*0562. Diffused at63°*4, in four cells, 
25*11, 25*36, 22*82, 23*59; mean 24*22 grs. for one cell. 
The rise of temperature from 50°*5 to 63°*4 increases the diffusion of the 1 per cent, 
solution of chloride of sodium from 5*70 to 6*32, or from 100 to 110*9, which is an in- 
crease of 0*843 per cent, for 1°. 
Diffusion of Chloride of Sodium in seven days at 63°*4 ; two cells. 
Grs. 
Ratio. 
From 1 per cent, solution . 
. . 6*32 
1*023 
From 2 per cent, solution . 
. . 12*37 
2 
From 4 per cent, solution . 
. . 24*96 
4*036 
From 8 per cent, solution . 
. . 48*44 
7*832 
