100 
PHARMACEUTICAL NOTICES. 
cipitating the solution by caustic potash or lime water ; or 
take, 
Crystallized Nitrate of Silver, §j. 
Caustic Potash, §vij. 
Pure Water, §xviij. 
Dissolve the nitrate of silver in two or three ounces of the 
water, and then separately the pure potassa in the remainder of 
the water; mix the two solutions, stir with a glass rod, and 
throw the whole upon a filter : finally, wash the precipitate 
from adhering alkali, and dry carefully. The product will be 
seven and a half drs. Oxide of silver is of a brownish gray 
color, but becomes darker by drying. It is very sparingly 
soluble in pure water, and exerts an alkaline re-action upon 
litmus reddened by an acid. 
Lozenges of Proto-carhonate of Iron. 
Since the introduction of theVallet's Pill, or pure proto-car- 
bonate of iron, rendered insensible to the attack of the oxy- 
gen of the atmosphere, by conversion into a pillular mass with 
honey, the old formula of Dr. Blaud has fallen into disuse. 
The last, as well as the more recent improvements first men- 
tioned, it will be recollected, was designed by the inventors 
to supersede that familiar, though very inconstant preparation 
known as precipitated carbonate of iron. This formula 
directed pills, formed with some difficulty, of sulphate of iron 
and carbonate of potash in equal proportions, and resulting in 
carbonate of iron and sulphate of potash from mutual decom- 
position. The only advantage gained by these pills, was the 
administration of a freshly prepared carbonate of iron, while 
no remedial value was anticipated or derived from the sul- 
phate of potash given along with it. These pills were not in- 
vincible to oxidation, and it was found that to preserve their 
efficiency it was necessary to coat them over with gelatine. 
The mass of Vallet's has been extensively employed in chlo- 
rosis, debility and nervous affections, where the use of a 
