Determining the Vapour Pressures of Solutions. 381 



not necessary to consider it further, except to saj that the numbers 

 in that series are in good accord with those in a series obtained by 

 the help of the ring-burner. 



In the first-named series no attempt was made to prevent the 

 slight condensation. The burners were dispensed with and the 

 equalisation of depths or " levelling " was effected by an automatic 

 device to which special attention must be drawn. 



(Plate 2.) 



The two metal tubes by which the steam ascended into the G-tubes 

 were perforated at p x p 2 (Plate 2). From each a narrow metal 

 tube was carried horizontally as far as q, when it bends up- 

 wards as far as r. At this point it gives place to a burette s. The 

 top of the burette fits into a metal tube at u which bends round, 

 first horizontally then vertically, and finally passes through the lid 



