76 



THE NATURE AND 



[SECT. ii. 



On comparing the two series it will be observed, that the pressure up to the 

 point where the liquids change wholly into vapour is greater in the tube con- 

 taining the least proportion of liquid ; but this I expect is entirely owing to the 

 mode of trial not being susceptible of much accuracy. Up to the point where the 

 change to vapour takes place, the formula derived from Dr. Ure's experiments 

 applies with admirable precision ; a new formula is necessary after the change. 

 The formation of vapour from the mercury in the apparatus most probably affects 

 the results in high temperatures. 



108. URE'S AND DALTON'S EXPERIMENTS ON ETHER. 



The ether employed by Mr. Dalton boiled in a tube at 96 , 1 and will be very 

 nearly represented by increasing the calculated quantity one fifth for the tem- 

 perature. Thus, for 132, we have 



and for 220, we have 



49-1 + = 58-92, 

 5 



194 + = 232-8, 

 5 



Dr. Ure's ether boiled at 104 or 105, and his experiments are very regular. 5 

 1 Thomson's Annals of Philosophy, vol. xv. p. 130. Diet, of Chemistry. 



