828 
PROFESSOR _GRAH AM ON THE DIFFUSION OF LIQUIDS. 
Diffusion of Chloride of Potassium in 5’71 days at 62°, and of Chloride of Sodium in 
7 days at 63°‘4. 
Chloride of potassium, 1 per cent. . 
6*69 
100 
Chloride of sodium, 1 per cent. . . 
6-32 
94-47 
Chloride of potassium, 2 per cent. . 
13-32 
100 
Chloride of sodium, 2 per cent. . . 
12-37 
92-86 
Chloride of potassium, 4 per cent. . 
25-94 
100 
Chloride of sodium, 4 per cent. . . 
24-96 
96-23 
Chloride of potassium, 8 per cent. . 
53-64 
100 
Chloride of sodium, 8 per cent. . . 
48-44 
90-30 
The difference would be about 1 per cent, greater if the diffusion of both salts were 
reduced to the same temperature. The chloride of potassium deviates of course from 
the nitrate of soda in a similar manner. But chloride of potassium 
corresponds more 
closely with nitrate of silver than with chloride of sodium and nitrate of soda, at the 
temperature of the experiments. 
Diffusion of Chloride of Potassium for 5'71 days at 
62°, and of Nitrate of Silver for 
7 days at 63°‘4. 
Chloride of potassium, 2 per cent. . 
13-32 
100 
Nitrate of silver, 2 per cent. . . . 
13-61 
102-18 
Chloride of potassium, 4 per cent. . 
25-94 
100 
Nitrate of silver, 4 per cent. . . . 
26-34 
101-54 
Chloride of potassium, 8 per cent. . 
53-64 
100 
Nitrate of silver, 8 per cent. . . . 
51-88 
96-71 
The coincidence in rate would appear even closer in the 2 and 4 per cent, solutions, 
if the diffusion of the nitrate of silver was diminished about 1 per cent., on account of 
its higher temperature. It might thus be supposed that the nitrate of silver followed 
the sodium rate more accurately than the nitrate of soda and chloride of sodium 
themselves do. 
A series of observations were made upon the diffusion of the 1 per cent, solution of 
chloride of potassium at a nearly constant temperature of 56°, but for different times, 
varying from five days to eight days, and eighteen hours, to discover the progression, 
which proved to be pretty similar to that of the 2 per cent, solution of hydrochloric 
acid. Six cells were diffused for each period, of which the mean result is given : the 
times advance by ten hours. 
