94 
ON REAGENTS AND THEIR USES. 
and magnesia, as well as sulphuric and hydrochloric acids. 
Used to precipitate chromic acid. 
Deutoxidc of Copper, for decomposing vegetable and ani- 
mal matters, and determining the elementary composition 
of'immediate principles: their proportion of hydrogen and 
carbon. 
Acetate and Sub-Acetate of Lead, to detect hydrosul- 
phuric acid in gases or mineral waters, and to precipitate acids 
and coloring matter from organic substances. 
Oxalate of Ammonia, used in mineral analyses to sepa- 
rate the lime and estimate its weight, by the quantity of 
oxalate of lime formed after the ammonia is driven off by 
heat. 
JDeuto-chloride of Platina, to discover potash, ammonia 
and their salts, in concentrated solutions. 
Deuto-chloride of Gold, to discover tin in solution. 
Iodide of Potassium, to distinguish metallic solutions 
from one another, such as lead, mercury, silver, bismuth, pla- 
tina, &c. 
Bi-carb. Potassa, to separate magnesia from its solutions, 
&c. 
Sulphate of Soda, to precipitate from their acid solutions, 
the oxides of barium, strontium, and lead. 
Succinate of Ammonia, to separate peroxide of iron from 
other metallic oxides which form with succinic acid salts, so- 
luble, or partially so, in water. 
Gelatine, for precipitating tannin. 
Tincture of Galls, for detecting iron. 
Tinct ure of Iodine, to detect starch. 
Tincture of Litmus, for detecting the presence of acids. 
Chloride of Calcium, for drying gases. 
Nitrate of Potash, Bi-borate of Soda, Phosphate of Soda 
and Ammonia, and Carbonate of Soda, as fluxes. 
Turmeric and Litmus papers, Starch, fyc. 
The saturated solutions of the above mentioned substances, 
when kept, should be always preserved in glass stop vials. 
With these articles might also be included, a small stock of 
