ime 
AGAIN, after ten evaporations I procured from one pound of 
this fubftance 505 ‘grains of tartar vitriolate,‘the laft portions 
of which appeared by the teft of the nitrous folution of filver 
to contain fome digeftive falt, and alfo 36 grains of this laft 
containing a portion of tartar vitriolate; about 18 grains of earth 
were depofited during the evaporations. The remainder of the 
pound, after all thefe deductions, muft have confifted of pure 
mere alkali. Hence the ingredients in a pound muft have been 
nearly in the following quantities ; 
Fixed air - - 1290 
Moifture - - 414 
Tartar vitriolate - - 505 
Die hive falt and ditto - 36 
Earth - a = 38 
2283 5760 
“Mere alkali - = 3477. 2283 
5760 3477 
DiscusTepD by the tedioufnefs of thefe experiments, and re- 
collecting that the alkaline part of thefe falts was that alone with 
which bleachers had any concern, I bethought myfelf of an eafy 
practical method of difcovering the prefence of this principle, 
and determining its quantity in all fubftances in which it exifts, 
either uncombined, or combined only with fixed air or fulphur. 
SECTION 
