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XLI. On the Heal of Vapours and on Astronomical Re- 

 fractions. By JOHN WILLIAM LUBBOCK, Esq., Treas. 

 U.S. F.R.A.S. andF.L.S., Vice- Chancellor of the University 

 of London, fyc. 



[Continued from vol. xvi. p. 569.] 



On the Vapours of JEther, Alcohol, Petroleum, and Oil of 

 Turpentine. 



PHE following Table is extracted from a valuable paper 

 by Dr. Ure in the Phil. Trans, for 1818.* 



Table of the pressure of the vapours of aether, alcohol, petro- 

 leum or naphtha, and oil of turpentine. 



[* Or Phil. Mag., First Series, vol. liii, p. 95.] 



