44 MATERIA MEDICA AND THERAPEUTICS. 



Source. Made by dissolving Benzoic Acid 

 in Solution of Ammonia, evaporating, and crys- 

 tallising. 



Characters. Colourless laminar crystals, 

 with a characteristic odour. Solubility, 1 ia 5 

 of water. 



Dose. 10 to 20 gr. 



ii. Ammonia Nitras. Nitrate of Am- 

 monia. NH 4 N0 3 . 



Source. Made by neutralising Diluted 

 Nitric Acid with Solution of Ammonia (or Car- 

 bonate of Ammonia), crystallising, and fusing. 



Characters. A white deliquescent salt, in 

 confused crystalline masses, with a bitter acrid 

 taste. 



Used only for making nitrous oxide gas 

 (N 2 0). 



&_. Ammonia? Carbonas. Carbonate of Ammonia. 

 N 4 H 16 C 3 8 . 



Source. Made by subliming a mixture of Chloride 

 of Ammonium (or Sulphate of Ammonia), with Carbonate 

 of Lime. 6NH 4 C1 + 3CaC0 3 = N 4 H 16 C 3 8 + 3CaCl 2 + 

 2NH 3 + H 2 0. 



Characters. Translucent crystalline masses, volatile 

 and pungent to the nose ; alkaline. Solubility, 1 in 4 of 

 water. 20 gr. neutralise 23 gr. citric acid, or 25| gr. 

 tartaric acid; 15 gr. neutralise 17 gr. citric acid, or 

 one tablespoonful of lemon juice. 



Impurities. Sulphates and chlorides. 



Dose. 3 to 10 gr. 



From A.minoni(E Carbonas are made : 



. Spiritus Ammonias Aromaticus. See page 43. 



ff. Liquor Ammonias Acetatis. Solution of 

 Acetate of Ammonia. NH 4 .C 2 H 3 O 2 dissolved in 

 water. 



Source. Made by neutralising Carbonate of 

 Ammonia by Acetic Acid, and adding water. 



Dose. 2 to 6 fl.dr. 



IAmmonii Chloridum is used in making Liquor 

 Hydrargyri Perchloridi. 



2. Aiiiiiioilii Broinidum. Bromide of Ammo- 

 nium. NH 4 Br. 



Characters. Colourless crystals, which become slightly 



