£6 Mr. Hatchett’s Analysis of 
remains in solution, which may be separated from the sulphuric 
acid by either of the fixed alkalis, or by ammonia. 
The sulphuric solution is not rendered turbid by the addition 
of water, until some minutes at least have elapsed ; when, there- 
fore, some prussiate of potash was added immediately after the 
water, the colour of the liquor became olive green, and a copious 
precipitate, of a beautiful olive colour, was gradually deposited. 
Tincture of galls, after a few minutes, caused the liquor to 
become turbid, and a very high orange-coloured precipitate was 
obtained. 
A few drops of phosphoric acid were added to a part of the 
concentrated sulphuric solution; and, after about 12 hours, the 
whole became a white opaque stiff jelly, which was insoluble in 
water. 
Potash, soda, and ammonia, whether pure or in the state of 
carbonates, separate the substance in question from the sul- 
phuric solution, in the form of a white flocculent precipitate ; 
and, when these alkalis are added to a considerable excess, they 
do not redissolve the precipitate, unless they are heated ; then, 
indeed, the fixed alkalis act upon it, and form combinations 
which have already been mentioned, but which we shall soon 
have occasion more particularly to notice. 
E. 
1 . The white precipitate, when recently separated from pot- 
ash, is soluble in boiling muriatic acid; and this solution majr 
be considerably diluted with water, without any change being 
produced. 
.2. A part was evaporated to dryness, and left a pale yellow 
substance, which was not soluble in water, and was dissolved 
