CALCIUM. 51 



a nauseous taste. Soluble in 6 parts of cold 

 water ; insoluble in spirit. 

 Dose. 5 to 10 gr. 



Calcis Hypophosphis is used to make : 

 (1) Sodas Hypophosphis. See Soda. 



c. Calcii Chloridum. Chloride of Calcium. CaC^. 



Source. Made by neutralising Hydrochloric Acid 

 with Chalk, and evaporating to dryness. CaC0 3 -|- 

 2HCl=CaCl 2 +C0 2 +H 2 0. 



Characters. White, very deliquescent masses ; solu- 

 bility, 1 in 2 of water. 



Impurities. Carbonates, salts of alumina, and iron ; 

 Hypochlorites, detected by evolving Cl with HC1. 



Dose. 10 to 20 gr. 



Calcii Chloridum is used to make : 



a. Calcis Carbonas Prsecipitata. Precipitated 

 carbonate of lime. CaC0 3 . 



Source. Made by mixing boiling solutions 

 of Chloride of Calcium and Carbonate of Soda, and 

 washing the precipitate. CaCLj+ Na2C0 3 =CaC0 3 + 

 2NaCl. 



Characters. A white crystalline powder, in- 

 soluble in water. Dose, 10 to 60 gr. 



Calcis Carbonas Precipitata is contained in Tro-J 

 chisci Bismuthi (4 gr. in each). 



2. Calcis Phosphas. Phosphate of lime. Ca^PCy 



Source. Made by (1) dissolving Bone-ash in Hydrochloric 

 acid ; and (2) adding Solution of Ammonia, and washing and 

 drying the precipitate. (1) Ca a 2PO 4 + 4HC1 = CaH 4 2P0 4 + 

 2CaCL ; (2) CaH 4 2P0 4 + 2CaCl2 + 4NH 4 HO = Caj2P0 4 + 

 4NH 4 C1 + 4H 2 0. 



Characters. A light white amorphous powder, insoluble 

 in water. 



Dose. 10 to 20 gr. 



Calcis Phosphas is contained in : 



Pulvis Antimoiiialis (2 parts in 3). See Antimonium. \ 



ACTION AND USES. 

 1. IMMEDIATE LOCAL ACTION AND M 



Externally. Lime in the form of the hydrate is caustic, 

 like the alkalies, but its action is more localised, so that it may 



