432 0. L. Speyers — Molecular Weights of Liquids. 



cases to be considered after we remark that a set of equations 

 exactly similar to (3), (4), (5), (6), (7) and (8), hold for liquid 2, 

 the two sets of equations being connected by the relations 



<' + ™ 2 N 2 ' =w 2 . 



The cases in question are mixtures of anilin with amylene 

 (trimethyl ethylene), and nitrobenzene with methyl iodid, with 

 amylene, with ether, and with pentane, all investigated by 

 Konowalow.* Only the first and last however gave coexistent 

 phases. The others were above their critical temperatures. 

 The highest temperature of the anilin mixture being 25 '1° only 

 the amylene was supposed to have an appreciable vapor tension 

 and we are limited to the activity factor of the anilin only. 

 For a similar reason we can find the activity factor of the nitro- 

 benzene only, the temperature of the mixtures containing it 

 being 18'1°. 



1 



80 



;o 



60 



50 

 HO 



30 

 20 

















































\ 

















\HH.S 















/ 



f'hyieVt. 















/ 





















10 







r\ 



















10 



IX 



/r 



/6' 



Figure 1 shows the compositions of the two coexistent phases 

 for the anilin mixture from the critical temperature 14'5° 

 down. The critical composition is 44*5 per cent gram molecules 

 of anilin. 



The following table contains the data necessary for finding 

 the activity factor of the anilin. In it t° is the temperature, jo 



* 1. c. 



