Prof. Graham on the Diffusion of Liquids, 



191 



circumstances, was 1*41 and 1-20 grs. in two cells; and con- 

 sisted of — 



Coagulable albumen . . 0*63 gr. 



Soluble salts 1*98 gr. 



2-61 grs. 



The diffusion product of a solution of 7j 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 dif- 

 fused from albumen contained 1*32 gr. of potash or 23-9 per 

 cent., which is a high proportion, 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 re- 

 tains 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 tempe- 

 rature during the period of eight days was remarkably uni- 

 form, 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 





