PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
485 
Carbonate of Potash . — Time of diffusion 8‘083 days, or double the time of hydrate 
of potash. The usual number of eight cells of the 1 and 2 per cent, solutions were 
diffused, with four cells of the 4 and 8 per cent, solutions, and the diffusates of each 
proportion determined by alkalimetric experiments as with the preceding alkaline 
hydrates. 
1. 1'002 per cent, of carbonate of potash, density r00957, diffused at 63°'7j gave 
6T5 grs. for two cells ; calculated for 1 per cent., 6T3 grs. of carbonate of potash in 
two cells. 
2. 2‘005 per cent, of carbonate of potash, density TO 1843, diffused at 63°’7j gave 
1T95 grs. for two cells ; calculated for 2 per cent., 1T92 grs. of carbonate of potash 
in two cells. 
3. 4*01 percent, of carbonate of potash, density T035775 diffused at 63°'7, gave 
1T48 grs. for one cell ; calculated for 4 per cent., 1T44 grs. of carbonate of potash 
in one cell. 
4. 8*02 per cent, of carbonate of potash, density T06935, diffused at 63°'7, gave 
22*79 grs. for one cell; calculated for 8 per cent., 22*72 grs. of carbonate of potash 
in one cell. 
5. 2*005 per cent, of carbonate of potash, density 1*01843, diffused at 68'**2, gave 
12*64 grs. for two cells; calculated for 2 per cent., 12*62 grs. of carbonate of potash 
in two cells. 
Diffusion of Carbonate of Potash in 8*08 days at 63°*7 ; two cells. 
Grs. Ratio. 
From 1 per cent, solution . . . 6*13 1*028 
From 2 per cent, solution . . . 11*92 2 
From 4 per cent, solution . . . 22*88 3*839 
From 8 per cent, solution . . . 45*44 7*624 
Comparative Diffusion of Hydrate of Potash in 4*04 days at 63°*4, and 
Carbonate of Potash in 8*08 days at 63°*7. 
From solutions of 
1 per cent. 
2 per cent. 
4 per cent. 
8 per cent. 
Hydrate of potash 
100 
93-48 
100 
92-81 
100 
91*36 
100 
86-97 
Carbonate of potash 
The diffusion of hydrate of potash appears to be excessive when compared with the 
carbonate of potash, as well as when compared with the hydrate of soda. 
Carbonate of Soda . — Time of diffusion 9*8994 days. The usual number of eight cells 
of the 1 and 2 per cent, solutions of this substance were diffused, and four cells of the 
4 and 8 per cent, solutions, and the diffusates determined by alkalimetric experi- 
ments. 
3 R 
MDCCCLI. 
