CALCIUM. 49 



Source. Made from Chalk by elutriation and sub- 

 sequent drying. 



Characters. A white amorphous powder, insoluble 

 in water ; incompatible with all acids and sulphates. 



Impurities. Alumina and oxide of iron. 



Dose. 10 to 60 gr. 



Preparations. 



a. Mistura Gretas. Chalk Mixture. Prepared 

 Chalk, Gum Acacia, Syrup, and Cinnamon Water. 

 1 in 32. Dose, 1 to 2 fl.oz. 



. Pulvis Cretee Aromaticus. Aromatic Pow- 

 der of Chalk. Prepared Chalk, Cinnamon, Nutmeg, 

 Saffron, Cloves, Cardamoms, and Sugar. 1 in 4. 

 Dose, 1?4BP gr. 



From Pulvis Crette Aromaticus is made : 



i. Pulvis Cretge Aromaticus mm 

 Aromatic Powder of Chalk and Opium. 39 parts 

 of Aromatic Chalk Powder, mixed thoroughly 

 with 1 part of Opium in powder. 1 of opium in 

 40. Dose, 10 to 40 gr. 



y. Hydrargyrum cum Creta. Mercury with 

 Chalk. Mercury, 1 ; Prepared Chalk, 2. Dose, 3 

 to 8 gr. 



b. Calx. Lime. CaO (with some impurities). 

 Source. Made by calcining Chalk. CaCO = CaO 

 + C0 2 . 



Characters. Compact whitish masses. 



From Calx is made : 



a. Calcis Hydras. Slaked Lime. Hydrate 

 of Lime. CaH 2 O 2 (with some impurities). 



Source. Made by slaking Lime with distilled 

 water. CaO + H 2 = CaH 2 O 2 . 



Characters. A white powder, strongly alkaline. 

 Soluble in 900 parts of water. Incompatible with 

 vegetable and mineral acids, alkaline and metallic 

 salts, and tartar emetic. 



Preparations. 



i. Liquor Calcis. Solution of Lime. Lime 

 Water! Made by shaking up Slaked Lime in 

 Distilled Water, and decanting after the excess 

 E-8 



