THE CODEX AND THE BRITISH PHARMACOPEIA. 
69 
116. Carbonate de Manganese. Mn0C0 2 = 57 6. 
Carbonas Manganosus. 
Manganous Carbonate. 
Crystals of sulphate of manganese . Two hundred grammes . . . 200 
Crystals of carbonate of soda . . . Two hundred and sixty grammes 260 
Dissolve separately in hot water the two salts, filter the solutions, and mix 
them in a sufficiently large vessel, a white precipitate of carbonate of manganese 
will be formed, allow it to settle, pour off the supernatant liquor, and replace it 
by an equal quantity of hot water, repeat the washing until the water is taste¬ 
less, collect then the precipitate and form it into cakes. 
Carbonate of manganese is a white powder, with a very slight rose tint, not 
altered by exposure to the air, entirely dissolved by hydrochloric acid, and the 
solution should not yield a blue colour upon the addition of ferroeyanide of 
potassium. Not in P. B. 
117. Carbonate de Chattx.* CaOCO 2 = 50. 
Carbonas Calcicus. 
Carbonate of Lime. Calcic Carbonate. 
Fused chloride of calcium .... One hundred grammes . . . 100 
Crystals of carbonate of soda . . . Two hundred and sixty grammes 260 
Dissolve each of the salts in a litre of water, filter the solutions and mix them, 
when the carbonate of lime is deposited pour off the liquor, and wash the pre¬ 
cipitate until the water no longer gives a precipitate with nitrate of silver. 
Collect the deposit, and form it into cakes or pastilles. 
This preparation is not in the P. B., but resembles the precipitated chalk of 
commerce. The prepared chalk of the P. B. and that in general use is chalk 
freed from its impurities by elutriation and fashioned into conical-shaped pieces 
and dried. 
119. Bicarbonate de Potasse.* K0,H0,C 2 0 4 = 100T. 
Carbonate de Potasse Sature. Bicarbonas Potassicus. 
Saturated Carbonate of Potash. Potassic Bicarbonate. 
Carbonate of potash (salt of tartar) . One hundred grammes . . 100 
White marble.Two hundred grammes . . 200 
Hydrochloric Acid.. . . . Q. S 
The production of bicarbonate of potash is by passing carbonic acid gas into 
a solution of carbonate of potash ; in the Codex the gas is generated in the 
ordinary way by pouring hydrochloric acid upon pieces of marble in a tubulated 
bottle, by means of a tube with a funnel mouthpiece ; in the P. B. the tubu¬ 
lated bottle, in which the pieces of marble are placed, has some small holes 
drilled in the bottom, and this is put into any convenient jar of the same height 
but of rather larger diameter, containing the hydrochloric acid previously diluted 
with water. 
120. Bicarbonate de Soude. # Na0,H0,C 2 0 4 = 81. 
Carbonate de Soude Sature. Bicarbonas Sodicus. 
This salt is prepared in a manner somewhat similar to that of the preceding, 
with this exception, that the soda is not dissolved, but broken into pieces of 
about an inch, and placed upon a perforated diaphragm in a properly constructed 
earthen or glass vessel ; one tube in the lowest part of the vessel carries off the 
