and aitrablive Powers of various J 'aline Subfiances. .29 ■ 
fhould be 1,770, which wants lefs than 1 oooth part in 270a 
of being juft. 
Again: in the mixture, whofe fpecific gravity was 1,719 
the fum of the Ioffes was 1779,549,, and the weight of the 
whole 2878,4, the mathematical fpecific gravity fhould be 
1,617, to which adding 0,100, the fpecific gravity 
by obfervation fhould be 1,717, which is nearly the truth. 
By continuing thefe mixtures until the fpecific gravities by 
calculation and obfervation nearly coincided, I formed the fol- 
lowing table.* The extra-tabular proportions are to be fought 
in the manner already fhewn ; the two firft feries were formed- 
by analogy,. 
