50 ART. 10. — K. IKEDA : STUDIES ON THE 



was volatilized and was present partly in the gaseous phase and 

 partly in the reverse condenser as liquid. This source of error 

 must be the more serious, the greater the molar fraction of paral- 

 dehyde. It is therefore to be regretted that the anthor deter- 

 mined the composition of the solution from the quantities of the 

 substances put into the boiling vessel and not in a manner more 

 direct. Moreover the boiling point of paraldehyde is more than 

 a hundred degrees higher than that of the other component, a 

 difference certainly too large for the exact applicability of equa- 

 tion (11). 



It is not improbable that the chemical species of an as- 

 sociated liquid as a rule behave towards each other as the 

 components of ideal solutions. 



According to Hollmann the freezing point of the system 

 acetaldehyde "^ paraldehyde in the presence of a catalyser lies at 



T—213° = 6.75° 



This temperature he calls the natural freezing point of the 

 system, and corresponds to the freezing point of an associated 

 liquids as it is usually observed. The composition of the system 

 at this point is 



6'ß = 0.883. 



The natural boiling point of the system has been deter- 

 mined to be 



r-273° = 41.6°, 



with the composition 



Cß = 0.5.34. 



