10 
PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
addition of acetic acid, in the same circumstances, was r41 and r20 grs. in two 
cells ; and consisted of — 
Coagiilable albumen 0‘63 gr. 
Soluble salts 1’98 gr. 
2’6I grs. 
The diffusion product of a solution of 7^ parts of chloride of sodium to 100 water, 
from similar cells and for the same time and temperature, would amount to about 
30 grs. of salt. It is to be remarked also that 5'53 grs. of the ignited salt diffused 
from albumen contained r32 gr. of potash or 23'9 per cent., which is a high propor- 
tion, and indicates that salts of potash diffuse out more freely from albumen than 
salts of soda. 
Nor does albumen impair the diffusion of salts dissolved together with it in the 
same solution, although the liquid retains its viscosity. Three other substances, 
added separately in the proportion 5 parts to 100 of the undiluted solution of egg 
albumen, were found to diffuse out quite as freely from that liquid as they did from 
an equal volume of pure water : these were chloride of sodium, urea and sugar. 
Urea proved to be a highly diffusible substance. It nearly coincided in rate with 
chloride of sodium. 
A second series of salts were diffused containing 1 part of salt to 10 of water ; a 
smaller proportion of salt which admits of the comparison of a greater variety of 
salts. The temperature during the period of eight days was remarkably uniform, 
60=— 59°. 
Table III. — Diffusion of solutions of 10 salt to 100 water at 59°'5. 
Name of salt. 
Density of 
solution at 60°. 
Anhydrous salt diffused. 
In grains. 
Means. 
Chloride of sodium 
1-0668 
32-3 
Chloride of sodium 
1-0668 
32-2 
32-25 
Nitrate of soda 
1-0622 
30-7 
30-7 
Chloride of potassium 
1-0596 
40-15 
40-15 
Chloride of ammonium 
1-0280 
40-20 
40-20 
Nitrate of potash 
1-0589 
35-1 
Nitrate of potash 
1-0589 
36-0 
35-55 
Nitrate of ammonia 
1-0382 
35-3 
35-3 
Iodide of potassium 
1-0673 
37-0 
37-0 
Chloride of barium 
1-0858 
27-0 
27-0 
Sulphate of water 
1-0576 
37-18 
Sulphate of water 
1-0576 
36-53 
36-85 
Sulphate of magnesia 
1-0965 
15-3 
Sulphate of magnesia 
1-0965 
15-6 
15-45 
Sulphate of zinc 
1-0984 
15-6 
Sulphate of zinc 
1-0984 
16-0 
15-80 
Before adverting to the relations in diffusibility which appear to exist between 
certain salts in the preceding table, I may state the results of the diffusion of the 
same solutions at a lower temperature. 
