and atiradilve Powers of various Jaime- Subfiances , 297 
fiould be 1,770,, which wants lefs than 1 oooth part in 2700: 
of being juft. 
Again:, in the mixture,, whole 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 ftiould be 
— -1,61-7, tQ which adding 0,100, the fpecific gravity 
by obfervation ihould 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 ftrft feries were formed: . 
