PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
827 
These numbers resemble closely those obtained in the diffusion of chloride of barium 
during- the longer period of 8-57 days. 
The chloride of sodium and nitrate of soda will be seen to exhibit the usual approach 
to parallelism between the chloride and nitrate of the same metal, by the following 
comparison : — 
Diffusion of Chloride of Sodium and Nitrate of Soda, both at 63°‘4. 
Chloride of sodium, 2 per cent. . 
. 12*37 
100 
Nitrate of soda, 2 per cent. . . 
. 12*35 
99*83 
Chloride of sodium, 4 per cent. . 
. 24*96 
100 
Nitrate of soda, 4 per cent. . . 
. 23*58 
94*48 
Chloride of sodium, 8 per cent. . 
. 48*44 
100 
Nitrate of soda, 8 per cent. . . 
. 47*74 
98*55 
As usual the chloride is slightly more rapid in its diffusion than the nitrate. 
33. Chloride of Potassium. 
Time of diffusion 5’71 days. The salt diffused was treated with nitrate of silver, 
and the chloride of silver weighed. 
1. Chloride of potassium, 1 per cent.; density T00697. Diffused at 62°, in eight 
cells, 6 - 70 , 6*75, 6-53, 6'77 ; mean 6'69 grs. of chloride of potassium for two cells. 
2. Chloride of potassium, 2 per cent. ; density 1*01333. Diffused at 62°, in eight 
cells, 13*36, 13*35, 13*60, 12*96 ; mean 13*32 grs. for two cells. 
3. Chlorideof potassium, 4 percent.; density 1*0258. Diffused at 62°, in four cells, 
12*51, 13*21, 13*46, 12*71 ; mean 12*97 gi's* for one cell. 
4. Chloride of potassium, 8 per cent. ; density 1*0503. Diffused at 62°, in four cells, 
26*88, 26*64, 26*15, 27*63 ; mean 26*82 grs. for one cell. 
Diffusion of Chloride of Potassium in 5*71 days at 62°; two cells. 
Grs. Ratio. 
From 1 per cent, solution . . . 6*69 1*005 
From 2 per cent, solution . . . 13*32 2 
From 4 per cent, solution . . . 25*94 3*895 
From 8 per cent, solution . . . 53*64 8*054 
The ratios are in remarkably close accordance with the proportions of salt 
diffused. 
The times 5*71 and seven days chosen for the chloride of potassium and sodium, it 
will be observed, are as the square roots of 2 and 3. A certain deviation from this 
ratio of the times of equal diffusion, appears on comparing the experimental results 
obtained at present for these salts. 
5 N 2 
