PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
487 
Comparative Diffusion of Carbonate of Potash in 8*083 days at 63°*7, 
and Carbonate of Soda in 9*9 days at 63°*4. 
From solutions of 
1 per cent. 
2 per cent. 
4 per cent. 
8 per cent. 
Carbonate of potash 
100 
98-20 
100 
98-15 
100 
93-63 
100 
87*44 
Carbonate of soda 
The carbonate of soda appears to preserve more analogy to the hydrate of soda in 
its diffusion than the carbonate of potash to the hydrate of potash. 
Comparative Diffusion of Hydrate of Soda in 4*937 days at 63°*3, 
and Carbonate of Soda in 9*9 days at 63°*4. 
From solutions of 
1 per cent. 
2 per cent. 
4 per cent. 
8 per cent. 
Hydrate of soda 
100 
103-62 
100 
105-50 
100 
102-68 
100 
98-27 
1 
Carbonate of soda 
Here we have a nearly equal diffusion with the times as 1 to 2 for the hydrate and 
carbonate of soda respectively. 
Sulphate of Potash . — Time of diffusion 8*083 days. The solution of diffused salt 
was evaporated to dryness and weighed. 
1. 1*005 per cent, of sulphate of potash, density 1*00844, diffused at 60°*3, in eight 
cells, 6*11, 6*21, 6*12, 6*32; mean 6*19 grs. in two cells; calculated for 1 per cent., 
6*16 grs. of sulphate of potash in two cells. 
2. 2*01 per cent, of sulphate of potash, density 1*01653, diffused at 60°*3, in eight 
cells, 11*61, 11*58, 11*50, 11*97; mean 11*66 grs. in two cells; calculated for 2 per 
cent., 11*60 grs. of sulphate of potash in two cells. 
3. 4*02 per cent, of sulphate of potash, density 1*03240, diffused at 60°*3, in four 
cells, 10*80, 11*33, 11*20, 12*07; mean 11*35 grs. for one cell; calculated for 4 per 
cent. 11*35 grs. of sulphate of potash in one cell. 
4. 8*04 per cent, of sulphate of potash, density 1*06306, diffused at 60°*3, in four 
cells, 2T91, 21*93, 22*00, 22*47; mean 22*08 grs. for one cell; calculated for 8 per 
cent., 21*96 grs. of sulphate of potash in one cell. 
Diffusion of Sulphate of Potash in 8*083 days at 60°*3 ; two cells. 
Grs. 
Ratio. 
From 1 per cent, solution . 
. . 6*16 
1*062 
From 2 per cent, solution . 
. . 11*60 
2 
From 4 per cent, solution . 
. . 22*70 
3*914 
From 8 per cent, solution . 
. . 43*92 
75*72 
The diffusion of sulphate of potash above, at 60°*3, appears to be similar to that of 
carbonate of potash at 63°*7s a higher temperature by 3°*4 (p. 413). The numbers 
for the sulphate of potash and hydrate of potash (p. 412) would probably correspond 
3 R 2 
