26 
PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
(1.) The carbonate and sulphate of potash and sulphate of ammonia were first dif- 
fused during a period of seven days, of which the temperatures observed by a ther- 
mometer placed near the water-jars were 64°‘5, 65°, 63°’5, 63°, 63°, 63°*5, 65° and 66° ; 
mean temperature 64°'2. 
Table VII. — Diffusion of Carbonate of Potash, Sulphate of Potash and Sulphate 
of Ammonia. 
Parts of anhydrous salt to 100 water. 
Density of 
solution at 60°. 
At 64 
’•2. 
At 37' 
’•6. 
Experiments. 
Mean. 
Experiments. 
Mean. 
Carbonate of potash. 
2 
1'0178 
5-36 
3-80 
5-55 
5-45 
3-91 
3-85 
4 
1-0347 
10-39 
6-99 
10-11 
10-25 
7-19 
7-09 
1-0572 
16-50 
11-42 
16-46 
11-08 
11-25 
17-05 
16-67 
10 
1-0824 
24-42 
24-94 
24-70 
24-69 
Sulphate of potash. 
2 
1-0155 
5-62 
3-93 
5-42 
5-52 
3-98 
3-95 
4 
1-0318 
10-49 
7-50 
10-65 
10-57 
7-31 
7-40 
1-0512 
17-07 
11-62 
16-89 
11-71 
11-66 
17-54 
17-17 
10 
1-0742 
23-40 
23-59 
23-88 
23-62 
Sulphate of ammonia, NH4 0. SO5. 
2 
1-0117 
5-71 
3-73 
5-45 
5-58 
3-79 
3-76 
4 
1-0229 
10-72 
7-54 
10-30 
10-51 
7-86 
7-70 
1-0369 
17-28 
10-94 
16-28 
10-98 
10-96 
16-80 
16-79 
10 
1-0529 
21-86 
22-49 
22-25 
22-20 
The diffusion product was obtained by evaporating the water of each jar separately 
as before, and the result is expressed in grains. 
It will be observed at once, on comparing the means of the experiments, that the 
three salts under consideration are remarkably similar in their diffusion, particularly 
with the smaller proportions of salt. Thus the mean diffusion of the 2,4, 6f and 10 
parts of the salts is as follows : — 
