1Acidum Arseniosum. Arsenious Anhydride. (Arsenicums. Arsenic. White Arsenic. Arsenious Acid.) Dose, 1/60 - 1/15 gr.; 1-4 mgms. Arsenious anhydride, As4 O6, occurs as a heavy white powder, or as stratified partially crystalline masses; tasteless, odourless, in aqueous solution slightly acid in reaction. Soluble 1 in 20 of hot water, 1 in 60 of cold; 1 in 8 of glycerin; moderately soluble in solutions of the hydrates and carbonates of the alkalies and in solutions of hydrochloric acid.

Incompatibles of arsenious anhydride and of arsenites, most metallic salts in solution, potassium iodide (1 dr. of potassium iodide in 1 dr. of

Arsenical Solution gives but a slight precipitate), mercuric chloride, tannic acid, hypophosphites in acid mixture.

1Liquor Arsenicalis. Arsenical Solution (Fowler's Solution). Dose, 2-8 min.; 0.1-0.5. c.c.

- 1; Potassium Carbonate, 1; Compound Tincture of Lavender, 3.125; Water, to 100 A reddish liquid alkaline to litmus. 1 gr. in 110 min.

Incompatibles, as an alkaline solution with acid solutions (Liquor Strychninse, Liquor, and Tinctura Ferri Perchloridi, etc.) alkaloids and most metals; see also above under Acidum Arseniosum.

1Liquor Arsenici Hydrochloricus. Hydrochloric Solution of Arsenic. Dose, 2 - 8 min.; 0.1 - 0.5 c.c.

- 1; Hydrochloric Acid, 1.25; Water to 100. A colourless liquid with an acid reaction. 1 gr. in 110 min.

Incompatibles, as for arsenious and hydrochloric acids.

3Arsenii Iodidum. Arsenious Iodide. Dose, 1/20 - 1/5 gr.; 3-12 mgms.

Small orange crystals or crystalline masses. Soluble in water and in alcohol.

Incompatibles, see above and as for any soluble iodide.

1Liquor Arseniiet Hydrargyri Iodidi. Solution of Arsenious and Mercuric Iodides. (Donovan's Solution.) Dose, 5-20 min.; 0.3-1.2 c.c. - 1; Mercuric Iodide, 1; Water, to 100. A clear, pale yellow liquid with a metallic taste. 1 gr. of each in 110 min. Incompatible with all alkaloids.

3Ferri Arsenas. Dose 1/16 - 1/4 gr.: 4 - 6 mgms (See p. 59).

3Sodii Arsenas. Dose 1 /40 - 1/10 gr.: 1 - 6 mgms. (See p. 94).

3Liquor Sodii Arsenatis. Dose 2-8 min.: 0.1-0.8 c.c. (see p. 94)

Asafetida. Asafetida. Dose, 5 - 15 grs.; 3 - 10 dgms. A gum resin obtained from the root of Ferula fetida. Flattened tears or masses of tears, dull yellow in colour, darkening on keeping,but yellowish or milky white within; odour strong alliaceous and persistent; taste bitter, acrid and alliaceous. Forms a white emulsion when triturated with water; in part soluble in alcohol.

3Tinctura Asafetidę. Dose, 30 - 60 min.; 2 - 4 c.c. - 20; Alcohol;70% to 100: by maceration. Pilula Aloes et Asafetidę, see Aloe.

Atropina, see Belladonna. (p. 40).

Aurantii Cortex Recens. Fresh Bitter Orange Peel. The fresh outer part of Citrus Aurantium var. Bigaradia.

1Tinctura Aurantii. Dose, 30 - 60 min.; 2 - 4 c.c. - 25; Alcohol, to 100.

1Syrupus Aurantii. Dose, 30 - 60 min.; 2 - 4 c.c. - 12.5; Syrup, 87.5.

3Syrupus Aromaticus. Dose, 30 - 60 min.; 2 - 4 c.c. - 25; Cinnamon Water, 25: Syrup, 50.

3Vinum Aurantii. Made by fermenting a saccharine solution to which Bitter Orange Peel has been added. Contains 10% of ethyl alcohol.

Aurantii Cortex Siccatus. Dried Bitter Orange Peel. The above dride 2Infusum Aurantii. Dose, 1/2 - 1 fl. oz.; 15 - 30 c.c. - 5; boiling Water, to 100.

3Infusum Aurantii Compositum. Dose, 1/2 - 1 fl. oz.; 15 - 30 c.c. - 2.5; Fresh Peel, 1.25; Cloves, 0.63; boiling Water, to 100.

Aqua Aurantii Floris. Orange-flower Water. Obtained by distilling the flowers of Citrus aurantium var. Bigaradia with water.

Syrupus Aurantii Floris. Dose, 30 - 60 min.; 2 - 4 c.c. - 11.12; Sugar, 66.67; Water, to 100.

Balsamum Peruvianum. Balsam of Peru. Dose, 5 - 15 min.; 0.3 - 1 c.c.

A balsam exuded from the trunk of Myroxylon Pereirae, after the bark has been beaten and scorched. A viscid liquid, in bulk black, but in thin layers deep orange-brown or reddish-brown, and transparent; odour agreeable and balsamic; taste, acrid and leaving a burning in the throat if swallowed.

Insoluble in water; soluble 1 in 1 of alcohol but made turbid by two volumes.

Important active constituents, benzyl benzoate and cinnamate.

Balsamum Tolutanum. Balsam of Tolu. Dose 5 - 15grs.; 3 - 10 dgms. A balsam exuded from the trunk of Myroxylon toluifera, when incised. At first a soft and tenaceous solid, it becomes hard and brittle when dried: in thin films it is transparent and yellowish-brown in colour: odour fragrant; taste aromatic and slightly acid. Important active constituents, free cinnamic acid, benzyl cinnamate and benzoate. Insoluble in water soluble in alcohol.

1Syrupus Tolutanus. Dose 30 - 60 min.; 2 - 4 c.c. Contains 2.62% of balsam and 66.5% of sugar by weight.

1Tinctura Tolutana. Dose, 30 - 60 min.; 2 - 4 c.c. - 10; Alcohol 100: by maceration.