Dose 0.2 - 0.7 gm., HC1.NH20H.C6H3: As.C6H3.OH.NH2-HC1 is a yellowish powder which dissolves slowly in water giving a clear acid solution. Neutralized with normal solution of caustic soda a precipitate occurs which again dissolves on the addition of more alkali when the sodium salt of dioxydiamino-arsenobenzol NaO.NH2C6H3As: C6H3.NH2ONa has been formed. This salt is used for both intravenous and intramuscular injection. It is not stable and must be prepared fresh as required. For intravenous infusion the slight excess of alkali formed, is neutralized with 1% acetic acid and diluted with normal saline. (Trade name Salvarsan; "606").

2Elixer Aromaticum. Aromatic Elixer. Dose, 1/2 - 2 fl. dr.; 2 - 8 c.c. Compound Spirit of Orange, 2.5; Syrup, 37.5; Purified Talc, 3; Alcohol, a sufficient quantity; Water to 100. Filtered.

2Elixer Aurantii. Elixer of Orange, 15-60 min.; 1 - 4 c.c. Oil of Bitter Orange, 0.3; Alcohol, 30; Syrup,. 35; Cinnamon Water to 100.

2Elixer Bismuthii. Elixer of Bismuth. Dose, 1/2 - 1 fl. dr.; 2 - 4 c.c Bismuth and Ammonium Citrate, 3.3; Distilled Water, hot, 6; Solution of Ammonia a quantity sufficient (to keep the mixture clear); Aromatic Elixer to 100.

1Emulsio Olei Morrhuæ. Emulsion of Cod-liver Oil. Dose, 1/4 - l fl. oz.; 8 - 30 c.c.

Cod-liver Oil, 50; Gum Acacia, 12.5; Syrup, 6.25; Oil of Bitter Almonds, 0.1; Water to 100.

Enema Aloes. Aloes, 0.75; Potassium Carbonate, 0.25; Glycerin 10; Mucilage of Starch to 100. 10 fluid ounces are used.

Enema Opii. Tincture Opium 3. Mucilage of Starch to 100. 2 ounces are used.

Enema Terebinthinæ. Oil of Turpentine, 2; Mucilage of Starch to 100. 16 fluid ounces are used.

Ergotoxina. Ergotoxine. Dose, 1/12 - 1/6 gr.; 5 - 10 mgms. An alkaloid, an active principle of ergot. A light, white, amorphous powder. Practically insoluble in water. Its salts are, however, soluble.

Ethylis Chloridum. Ethyl Chloride. C2H5C1. A colourless, mobile liquid, with a sweetish burning taste, and an agreeable odour. Boiling-point 12.5°C.

Ethylmorphinæ Hydrochloridum. Ethylmorphine Hydrochloride. Dose, 1/10 - 1/2 gr. 6 - 30 mgms.

A white minutely crystalline powder, odourless with a bitter taste. Soluble 1 in 7 of water, 1 in 5 of alcohol. (Trade name, Dionin.)

Eucalyptol. Eucalyptol. Dose, 1 - 5 min.; 0.06 - 0.3 c.c. A purified substance prepared from the oil of eucalyptus and other sources. A colourless liquid, with a characteristic aromatic camphoraceous odour and a spicy pungent taste, leaving a cool sensation in the mouth. Mis-cible in all proportions with alcohol, but not with water.

2Gargarisma Acidi Tannici. Tannic Acid Gargle. Glycerin of Tannic Acid. 10; Water to 100.

2Gargarisma Aluminis. Alum Gargle. Alum, 2; Acid Infusion of Roses to 100.

2Gargarisma Boracis. Borax, 4; Water to 100.

2Gargarisma Potassii Chloratis. Potassium Chlorate, 2; Diluted Hydrochloric Acid, 1; Water to 100.

2Gossipium Acidi Borici. Boric Acid Wool. Cotton Wool immersed in a saturated solution of boric acid tinged with aniline red and removed and dried. Contains 40-50% of boric acid.

Guaiacol. Guaiacol. Dose, 1 - 5 min.; 0.06 - 03 c.c. C6H4OCH3OH. Obtained either synthetically or by the fractional distillation of wood creosote. An oily colourless liquid, with a penetrating, smoky odour and a caustic taste. Soluble 1 in 80 of water, miscible with alcohol ether and oils.

2Guaiacolis Carbonas. Guaiacol Carbonate. Dose, 5 - 15 grs.; 3 - 10 dgms. May be gradually increased to 30 grs.; 2 gms. The carbonic ester of guaiacol. A white crystalline powder almost without taste or odour. Soluble 1 in 70 of alcohol, insoluble in water.

Liquor Formaldehydi. A solution of formaldehyde obtained by dissolving in water formic aldehyde. A colourless transparent liquid with a pungent odour and a caustic taste. Miscible with water and alcohol. Should contain 38 - 39 % of aldehyde.

Hexamethylenamina. Hexamethylene-tetramine. (Hexa-methylenamine, Formamine.) Dose, 5 - 15 grs.; 3 - 10 dgms. (CH2)6N4. A white crystalline powder, odourless; in solution has an alkaline reaction. Soluble 1 in 1 1/2 of water, 1 in 8 of alcohol (Urotropin).

Methyl Salicylicum. Methyl Salicylic Ester (Oil of Winter-green). Dose 5 - 7 min. 0.3 - 0.5 c.c.

A light yellow oily fluid, soluble in fats, alcohol, and ether.

Methylthioninæ Hydrochloricum. (Methylene Blue.) Dose, 1-5 grs.; 1/2 - 3 dgms.

A dull dark-green crystalline powder. Soluble 1 in 50 of water, less soluble in alcohol.

2Mucilago Amyli. Mucilage of Starch, Starch 1.5; Water, to 100.

Parahydroxyphenylethylamine- (Dose 20 mgms.) soluble in water, probably an important active constituent of preparation of ergot. (Trade name Tyramine.)

Pelletierinæ Tannas. Pelletierine Tannate. Dose, 5 - 8 grs.. 3 - 5 dgms.

The tannate of an alkaloid obtained from the root-bark of pomegranate, Punica Granatum. A light yellow amorphous powder, greyish-white, odourless, with an astringent taste and an acid reaction. Soluble 1 in 700 of water, 1 in 80 of alcohol.

Phenolphthaleinum. Phenolphthalein. Dose, 1 - 8 grs.; 1/2 - 5 dgms.

A white or almost white amorphous or crystalline powder, odourless. Soluble 1 in 800 of water, 1 in 10 of alcohol. Trade names are many e.g. Laxans, Laxoin, Laxophen, Probilin, Purgen, etc.

Strontii Bromidum. Strontium Bromide. Dose, 5 - 30 grs.; 1/4 - 2 gms.

SrBr2, 6H20. Colourless transparent odourless crystals, deliquescent, and with a strong bitter saline metallic taste. Soluble 2 in 1 of water, 1 in 3 of alcohol.