Pom] 
fequently the quantity employed contained 136,68; whence it 
follows that 100 parts marble faturate 86,5 of the marine ftandard. 
To obtain a perfe@t folution a heat of 160° was employed to- 
wards the-end, 
From the proportion of pure calcareous earth already men- 
tioned, it follows that 158 grs. of this marble contained but 
82,26 of that pure earth. Then 82,26 parts lime take 86,5 of 
ftandard, confequently 100 parts lime fhould take 104,72. 
Accorpine to Mr. Wenzel, 100 parts lime take 103,6 of 
the. ftrongeft marine acid, but the circumftances were very dif- 
ferent from thofe in which he firft colleéted its degree of con- 
centration. 
~ Of Vitriokc Selenite. 
To 225 grs. of oil of vitriol, whofe fpecific gravity was 1,5654, 
I added 225 gts. of water, and of this mixture I took 439 gts. 
and gradually added to it at different times 152 grs. of finely 
powdered white marble, It was committed toa gentle fand heat, 
more water was added from time to time; the faturation was. 
obtained at the end of ten days. 
Tue quantity of acid employed contained 1 34 ers. ftandard ; 
hence 100 grs. ftandard take ‘up 113,4 of marble, and 100 parts 
marble require 88,17 of the vitriolic ftandard; but 100 parts of 
H 2 this 
