530 



Scientific Proceedings, Royal Dublin Society. 



vapour phases. It therefore becomes a connexion between Nernst's law of 

 distribution and molecular complexity. It is probable, however, in this case 

 that the molecular state of the substance in solution may also play a part. 

 The further investigation of this point is also being continued. 



160. 



i<io. aoo. 



20. 1-0. 60. flo. 100. ia.o. i<k>. 

 Weight (in grams) of distillate. 

 Fig. 5. 



By distilling an aqueous solution of a mixture of two acids having 

 different rates of volatilisation, it becomes evident that as the distillation 

 proceeds, the solution in the flask will become relatively richer in the less 

 volatile acid, so that the solution gradually changes in composition with a 

 corresponding change in the vapour. (Figs. 5 and 6 show the relation 



