PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
31 
salt. It is possibly a consequence of the crystallizing attraction, to which reference 
was lately made, coming into action in strong solutions and resisting diffusion. 
(6.) The diffusion of chlorate of potash was observed at a temperature ranging 
from 63° to 65°, of which the mean was 64°* 1. 
Table XII. — Diffusion of Chlorate of Potash. 
Parts of salt to 100 water. 
Density of 
At 64°*1. 
solution at 60°. 
Experiments. 
Mean. 
2 
1*0129 
6*97 
7*54 
7*16 
7*22 
4 
1*0246 
13*03 
13*64 
13*27 
13*31 
6-5 (saturated solution). 
1*0395 
21*30 
20*29 
20*76 
20*78 
The solutions of chlorate of potash must be evaporated and the residuary salt dried 
at a temperature not exceeding 212°, otherwise a very sensible quantity of chloride of 
potassium may be formed. The chlorate appears to be sensibly inferior in diffusibi- 
lity to the nitrate of potash. From the 4 per cent, solution of the chlorate we have 
a diffusion product of 13*27 grs., and from the corresponding solution of the nitrate 
13*97 grs. ; but the latter was obtained at a temperature 1°*8 higher than the former. 
It remains a question whether chlorate of potash does not really belong to the nitre 
group of salts, but has its diffusion interfered with by some secondary agency, such 
as its sparing solubility and consequent nearer approach to the saturating proportion. 
It is certainly true that the uniformity of diffusion generally increases with the 
dilution of the solutions. This appears on comparing the diffusion of the 4 per cent, 
solution of what may be called the sulphate of potash group, with the diffusions of 
the 2 per cent, solutions of the same salts. 
Diffusion of Salts of the Sulphate of Potash Class. 
4. 
2. 
Carbonate of potash 
10*27 
5*45 
Sulphate of potash 
10*57 
5*52 
Sulphate of ammonia 
10*51 
5*58 
Acetate of potash 
10*70 
5*85 
Bicarbonate of potash 
11*01 
5*81 
Chromate of potash 
11*19 
5*77 
Bichromate of potash 
11*49 
5*65 
Thus while the 4 per cent, solutions range from 10*27 to 1 1*49 grs., or from 100 to 
111*8, the 2 per cent, solutions range from 5*45 grs. to 5*85 grs., or from 100 to 107*3. 
As it appeared to be in dilute solutions that the greatest uniformity of diffusion is 
to be expected, a series of experiments was instituted upon the preceding salts, Mutli 
