134 INORGANIC AGENTS 



SECTION III. 



Alkaline Earth Metals: Calcium, Barium and Magnesium. 



Calcium. 



(The Metal Calcium Is Not Employed in Medicine. ) 



CaETA Pb/epahata. Prepared Chalk. Ca Co,. 

 (U. S. & B. P.). ^ 



Synonym. — Drop chalk, E. ; craie preparee, Fr. ; praparirte kreide, G. 



Derivation. — Made from chalk by levigation, elutriation and desiccation. 



Properties. — A white to grayish-white, very fine amorphous powder, often 

 formed into conical drops; odorless and tasteless; permanent in the air. Almost 

 insoluble in water; insoluble in alcohol. 



Incompatibles. — Sulphates and acids. 



Dose.— H., gi-ii, (30-60) ; C, gii-iv, (60-120) ; Sh. & Sw., 3ii-iv, (8-15) ; D., 

 gr.x-3i, (.6-4). 



PREPAKATIONS. 



Pulvis Gretce Compositus. Compound Chalk Powder. (U. S. P.) 

 Chalk, 30; acacia, 20; sugar, 60. 

 Dose. — D., gr.x-3i, (.6-4). 



Mistura Cretw. Chalk Mixture. (U. S. P. & B. P.) 

 Compound chalk powder, 20; cinnamon water, 40; water to make 100. 

 Dose.— D., gi-ii, (30-60). 



Pulvis Cretw Aromaticus. (B. P.) 

 Dose. — D., gr.x-3i, (.6-4). 



Pulvis Gretce Aromaticus Cum Opio. (B. P.) 

 (Contains 2% per cent, opium.) 

 Dose.— D., gr.x-xl, (6-2.6). 



Calcii Caebonas PRiEciPiTATus. Prccipitatcd Calcium Carbonate. CaCOa- 

 (U. S. & B. P.) 



Synonym. — Calcis carbonas prsecipitata, B. P.; precipitated carbonate of 

 lime, creta prsecipitata, E. ; calcium carbonicum prsecipitatum, P. G. ; carbonate 

 de chaux precipit6, craie prgcipitge, Fr. ; prsecipitirten kohlensauren kalk, G. 



Derivation. — Obtained by, precipitation of calcium chloride with sodium car- 

 bonate. 



CaCloJ-Na^COj- CaCO.,-(-2 NaCl. Dry the precipitate. 



Properties. — A fine white micro-crystalline powder, without odor or taste, and 

 permanent in the air. Nearly insoluble in water; insoluble in alcohol. The solu- 

 bility is increased by presence of ammonium salts and especially by carbon 

 dioxide. i 



Dose.— H., gi-ii, (30-60) ; C, gii-iv, (60-120) ; Sh. & Sw., 3ii-iv, (8-15) ; D., 

 gr.x-3i, (.6-4). 



CALCIUM CARBONATE. 



Action External. — Desiccant and slightly astringent powder; also 

 protective. 



Action Internal. — Alimentary Canal. — Calcium carbonate is the slo'vr- 

 est acting antacid, because of its comparative insolubility, and is of value 

 when it can exert its long-continued influence throughout the digestive 

 tract. It resembles bismuth in mechanically coating or protecting an 

 inflamed or irritable surface. It is not so astringent nor antiseptic as 

 the bismuth salts, and these are generally preferable to chalk for the 

 smaller animals. It is excreted unchanged in the feces. 



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