186 Prof. Graham on the Diffusion of Liquids, 



Table I.— Diffusion of Solutions of Density 1-200. Temp. 



66° Fahr. 



Placed in solution cell. 



Found in water-jar. 



Proportion of anhy- 

 drous salt, or of acid 



Boiling- 

 point. 



Diffusion product. 



protohydrate, to 100 







of water. 





In grains. 



Ratio. 



34-21 



225-5 



269-80 



100 



37-93 



227 



581-20 



21542 



2903 



223 



455-10 



16868 



34 86 



221 



320-30 



11871 



31-85 



216 



31900 



11S-23 



32-42 



220 



26020 



96-44 



2238 



214 



95 87 



35-53 



2156 



213| 



77-47 



28-71 



Chloride of sodium 



Nitric acid 



Sulphuric acid 



Chloride of potassium (density 1-178) 



Bisulphate of potash 



Nitrati of soda 



Sulphate of magnesia 



Sulphate of copper 



It appears that the diffusion from solutions of the same den- 

 sity is not equal but highly variable, ranging from 1 to 0*1333. 



The results also favour the existence of a relation between 

 large or rapid cliffusibility and a high boiling-point. The latter 

 property may be taken to indicate of itself a high degree of 

 attraction between the salt and water. 



I. Characters of Liquid Diffusion. 



1. Diffusion of Chloride of Sodium. 



The characters of liquid diffusion were first examined in 

 detail in the case of this salt. 



(1.) Do different proportions of chloride of sodium in solu- 

 tion give corresponding amounts of diffusion? 



Solutions were prepared of chloride of sodium in the pro- 

 portion of 100 water with 1, 2, 3 and 4? parts of the salt. 



The diffusion of all the solutions was continued for the same 

 time, eight days, at the mean temperature of 52°* 5 Fahr. 



Proportion of salt to 100 water. 



Diffusion product. 



In grains. 



Ratio. 



1 

 2 

 3 

 4 



2-78 



5 54 



8-37 



11-11 



1- 



1-99 

 301 

 4-00 



The quantities diffused appear therefore to be closely in 

 proportion (for this salt) to the quantity of salt in the diffusing 

 solution. The density of the solutions containing 1, 2, 3 and 

 4 parts of chloride of sodium, was at 60°, 1*0067, 1*0142, 



