Dose, 1/200 - 1/100 gr.; 0.3 - 0.6 mgms Colourless crystals, in solution with a bitter taste. Soluble 1 in 300 of water; readily in alcohol, chloroform, and ether.

Incompatibles of atropine and its salts, as for alkaloids; sodium and potassium hydrates and carbonates (not bicarbonates); decomposed by heating in acid, alkaline or neutral aqueous solution.

2Unguentum AtropinŠ. - 2; Oleic Acid, 8; Lard, 90.

lAtropinŠ Sulphas. Dose, 1/200 - 1/100 gr.; 1/3 - 2/3 mgms. Nearly colourless crystals. Soluble, 1 in 1 of water; 1 in 10 of alcohol; insoluble in ether and chloroform.

1Liquor AtropinŠe Sulphatis. Dose, 1/2 - 1 min.; 0.03 - 6.06 c.c. - 1 ;Salicylic Acid, 1.12; Water, to 100. 1 gr. in 110 min.

1Lamellae AtropinŠ. Gelatin disks each containing 1/5000 gr.

Benzoinum. Benzoin. A balsamic resin obtained from Styrax Benzoin, and probably other species. Flat or curved tears varying in size but seldom exceeding two inches in length and half an inch in thickness, yellowish or reddish-brown in colour externally, milky white internally, brittle when cold, softens when warmed and when heated emits fumes of benzoic acid: the tears may occur in agglutinated masses. Insoluble in water; soluble in alcohol

Important active constituent, benzoic acid.

1Adeps Benzoatus. Benzoated Lard. - 3 Lard, 100.

1Tinctura Benzoini Composita. (Friar's Balsam.) Dose, 30-60 min.; 2 - 4 c.c.

- 10; Storax, 7.5; Balsam of Tolu, 2.5; Socotrine Aloes, 1.83; Alcohol, to 100.

Acidum Benzoicum. Dose, 5 -15 grs.; 3 -10 dgms. Light colourless, crystalline scales or needles; odourless, or with a slight balsamic odour. Soluble, 1 in 390 of cold, 1 in 17 of boiling water; 1 in 3 of alcohol; and in ether, chloroform, fixed and volatile oils.

Incompatibles of benzoic acid and benzoates, silver, mercury, lead, and ferric salts in solution, quinine bisulphate; strong acids (free benzoic acid from benzoates leading to a precipitate if in strong solution); benzoic acid frees carbonic acid from carbonates.

3Trochiscus Acidi Benzoici. 1/2 gr. in lozenge made with the Fruit Basis.

Ammonii Benzoas (see Ammonium, p. 34). Sodii Benzoas (see Sodium, p. 94.)

Benzol. A mixture of hydrocarbons containing about 70% of benzene, and 20-30% of toluene. A colourless, volatile, inflammable liquid, with a characteristic odour.