72 MATERIA MEDIC A AND THERAPEUTICS. 



Source. Made by precipitating a solution of Oxalate of 

 Ammonia with a soluble salt of Cerium. 



Characters. A white granular powder ; insoluble in 

 water. 



Impurities. Alumina; detected by its solution in potash 

 giving precipitate with NH 4 C1. Other oxalates, the ash of 

 which gives effervescence with boiling HC1. 



Dose. I to 2 gr. 



ACTION AND USES. 



Nothing is definitely known about the physiological action 

 of cerium. It is given with benefit in vomiting, acid dyspepsia, 

 and heartburn, especially when they occur in pregTiancy ; and 

 has been credited with good effects in chronic nervous diseases 

 such as epilepsy and chorea. 



v FERRUM. IRON. Fe = 56. 



Wrought-iron in the form of wire or nails free 

 from oxide. Iron wire No. 35. 



Preparations. 



1. Mistura Ferri Aromatica. Iron Wire, 2, 

 Pale Cinchona Bark, 4 ; Calumba, 2 ; Cloves, 1 ; Compound 

 Tincture of Cardamoms, 12; Tincture of Orange Peel, 2 ; and 

 Peppermint Water, 50. 



Dose. 1 to 2 fl.oz. 



2. VJBiUlii Ferri. Iron wire digested in Sherry, 1 in 20 

 Dose. 1 to 4 fl.dr. 



From Ferrum are also made : 



3. Ferri Sulphas. Sulphate of Iron. FeS0 4 .7H 2 O. 

 Source. Made by dissolving Iron Wire in Sulphuric Acid 



and Water, and crystallising. 



Characters. Pale green rhombic prisms, with a styptic 

 taste. Solubility, 1 in 1 \ of water ; insoluble in spirit. 



Impurities. Persalts, giving sediment in aqueous solution. 

 Copper, precipitated by H 2 S. 

 Dose. 1 to 5 gr. 



Preparations. 

 From Ferri Sulphas are made : 



a. Ferri Sulphas Exsiccata. FeSo 4 .H 2 0. A dirty 

 white powder, made by heating the Sulphate. 

 9. to 3 gr. 



