and attractive Powers of various f aline Subjlances. 2 1 
fpecific gravity Ihould be 7“^ - 1 >355, which is exactly the 
fame as that which was found in 1 2 gr. of this fpirit of nitre, 
on the fuppofition that they contained 3,55 gr. acid. 
Again : when to 1984,5 gr. of this mixture I added 178,75 
gr. of water, the whole quantity of diluted fpirit of nitre was 
2163,25 gr. and the quantity of acid in 1984,5 gr. was 587,081 
gr. for 77 12 . 3,55 :: 1984,5 . 587,081 ; the lofs of this quan- 
tity of acid is 66,96 gr. and the fum of the Ioffes of acid 
and water is 1643,129 gr. ; and confequently the mathema- 
tical fpecific gravity fhould be ~ 1,31 5, which is the 
fame as that determined in 13,08 gr. of the fame mixture. 
By continuing thefe mixtures until I found the mathematical 
fpecific gravity and that by obfervation nearly to coincide, 1 was 
enabled to draw up the following table, in which if any errors 
be found, I hope they will be excufed, from the mipoffibiiity 
of avoiding them where the weights mu ft be found with fuch 
extreme precifion : the two firft feries were only found by 
analogy. 
1 
