T H K 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCEENCE. 



[SIXTH SERIES.] 



1^ ^CQlsos 



I) EC EMBER 1903. 



LXXX. On the Mutual Solubility/ of Liquids. — II. 



Bl/ J. P. KUENEN *. 



rf IHIS paper forms the continuation of a research the first 

 X part of which was published some years ao-o f. The 

 investigation has been continued principally with further 

 mixtures of hydrocarbons and alcohols. The advantages of 

 this combination of substances are, (1) that the critical points 

 of both components are not too high, and the observations 

 may thus be carried up to the critical region ; and (2) that, as 

 both components belong to series of substances many properties 

 of which progress regularly as we pass from term to term, 

 we may expect some similar progression to exist wath respect 

 to phenomena of mutual solubility. 



In the former paper a definite answ^er was given for the 

 first time to the question as to the effect of pressure on the 

 miscibility of liquids. The smallness of this effect makes it 

 advisable to test it where it is bound to be greatest, viz. in the 

 neighbourhood of a critical point for the liquids. With the 

 mixtures of ethane and ethyl-, propyl-, isopropyl-, and butyl- 

 alcohol a lower critical temperature was discovered, i. e. a 

 temperature below which the substances mix in all proportions 

 and above which tw^o liquid layers are possible ; in this case 

 pressure was found to have the effect of making the liquids 

 mix, when separated by a rise of temperature above the lower 



* Coramumcated bv tlie Author. 



+ Knenen & Robson, Phil. Map:, (o) vol. xlviii. pp. 180-203. I am 

 indebted to Mr. W. G. Kobson for his assistance in carrying out the 

 pre.«ent experiments. 



PliiJ. Mag. S. 6. Vol. 6. No. 3fi. Dfc. 1903. ^ 2 U 



