CHEMICAL THEORY OF SOLUTIONS. PART I. 63 



components, can be described quantitatively for varying tempera- 

 tures and pressures. We thus see the important service which 

 the study of the vapour tension may render to the solution of 

 chemical problems. In the following is given a concrete example 

 in which the foregoing deductions are completely realised. 



(2) The System Acetone and Ethyl Oxide. 



The total and partial pressures of this system at 0°C. have 

 been studied by Cunaeus (Zeits. physik. Chem., 36, 232 ; 1901). 

 Unfortunately I have not been able to consult the dissertation 

 in which he has given a detailed account of the measurements. 

 This is the more to be regretted because there seems to be 

 several misprints in the numerical data given in the " Zeitschrift," 

 as has been noticed by Bakhuis Roozeboom (Heterogene Gleich- 

 gewichte, II, 27, foot-note). In the followiug table his data are 

 reproduced. 



1) X in the original paper is the empirical molar fraction of ether, while liere it stands 

 for that uf acetone. 



