PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
491 
Oxalate of Potash. — Time of diffusion 8’083 days. The diffusate was evaporated 
to dryness, ignited, and then converted into chloride of potassium. 
1. 0'981 per cent, of anhydrous oxalate of potash, density 1*007755 diffused at 59°*8, 
in eight cells, 6*24, 6*22, 5*91, 5*97; mean 6*08 grs. for two cells; calculated for 
1 per cent., 6*20 grs. of oxalate of potash in two cells. 
2. 1*92 per cent, of oxalate of potash, density 1*01463, diffused at 59°*9, in eight 
cells, 11*54, 11*63, 11*94, 11*63; mean 11*68 grs. for two cells; calculated for 2 per 
cent., 12*17 grs. of oxalate of potash, in two cells. 
3. 3*84 per cent, of oxalate of potash, density 1*02864, diffused at 59°*9, in four 
cells, 11*10, 11*16, 11*09, 10*92; mean 11*07 gi’S- foi* one cell; calculated for 4 per- 
cent., 11*52 grs. of oxalate of potash in one cell. 
4. 7'68 per cent, of oxalate of potash, density 1*05604, diffused at 59°*9, in four 
cells, 20*45, 20*63, 20*99, 20*15 ; mean 20*55 grs. for one cell; calculated for 8 per 
cent., 21*41 grs. of oxalate of potash in one cell. 
Diffusion of Oxalate of Potash in 8*083 days at 59°*9 ; two cells. 
Grs. 
Ratio. 
From 1 per cent, solution . , 
6*20 
1*019 
From 2 per cent, solution . 
. 12*17 
2 
From 4 per cent, solution . 
. 23*04 
3*789 
From 8 per cent, solution . . 
. 42*82 
7*042 
The oxalate of potash corresponds well with sulphate of potash. 
Comparative diffusion in 8*083 days of Sulphate of Potash at 60°*3, 
and Oxalate of Potash at 59°'9. 
From solutions of 
1 per cent. 
2 per cent. 
4 per cent. 
8 per cent. 
Sulphate of potash 
100 
100-65 
100 
104-91 
100 
101-50 
100 
97-47 
Oxalate of potash 
The sensible exeess in the diffusion of the 2 per cent, solution of oxalate of potash 
is, I believe, to be accounted for by this pi’oportion having been estimated in the form 
of carbonate of potash instead of chloride of potassium. 
Oxalate of Soda. — Time of diffusion 9*9 days. The diffusate was evaporated to 
dryness, ignited and then converted into chloride, as with the preceding oxalate of 
potash. 
1. 0*925 per cent, of oxalate of soda, density 1*00882, diffused at 59°*9, in eight 
cells, 5*99, 5*81, 5*69, 5*59; mean 5*77 grs. for 2 cells; calculated for 1 per cent., 
6*24 grs. of oxalate of soda in two cells. 
It was found impossible to form a 2 per cent, solution of this salt from its sparing 
solubility, so that the observations respecting it are limited to the lowest proportion 
of salt. 
