15i INOBGANIO AGENTS 



Calcii Cakbonas Precipitatus. Precipitated Calcium Car- 

 bonate. CaC03. (U. S. & B. P.) 



8ynx)nym. — Calcis carbonas prsecipitata, B. P.; pre- 

 cipitated carbonate of lime, creta prsecipitata, carbonas cal- 

 cicus prsecipitatus, E.; calcaria carbonica prsecipitata, P. G.; 

 carbonate de chaux precipite, craie precipitee, Fr.; prse- 

 cipitirten koMensauren kalk, G. 



Derivation. — Obtained by precipitation of calcium chlo- 

 ride witli sodium carbonate. 



CaCl, +Na, CO, = GaCO, + 2 NaCL Dry the precipi- 

 tate. 



Properties. — A fine, white powder, without odor or taste, 

 and permanent in the air. Nearly insoluble in water; insol- 

 uble in alcohol. The solubility is increased by presence of 

 carbon dioxide. Permanent in air. 



Dose.—'R., 3 i.-ii. (30.-60.); C, 5 ii.-iv. (60.-120.); Sh. & 

 Sw., 3ii.-iv. (8.-15.); D., gr.x.-3i. (.6-4.). 



Calcium Carbonate. 



Action External. — Dessicant and slightly astringent 

 powder ; also protective. 



Action Internal. — Alimentary Canal. — Calcium carbonate 

 is the slowest 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 

 inflamed or irritable surfaces. 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 faeces. 



Administration. — Calcium carbonate may be given to 

 dogs in troches, pills or powder ; to other animals in powder, 

 balls or electuary. Chalk is commonly prescribed suspended 

 in flour gruel, milk or mucilage to the larger animals. The 

 official preparations are suitable for dogs. 



Uses. — Chalk forms a dusting powder for moist eczema, 



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