Calomel is a very suitable vermifuge in cases of ascarides. Both the round and the thread worms are expelled under the influence of 2 to 5 gr., which may be given early in the morning and followed in a few hours by a purgative draught. It is usual to combine the dose with powdered jalap, but I have found the mercurial alone sufficient, and it is more readily taken. Dr. Stille speaks well of the effect of a small portion of mercurial ointment placed in the rectum daily at bedtime, for destroying ascarides, also of the injection of 1/4 to 1 gr. of corrosive sublimate dissolved in water, but I doubt the wisdom of this treatment.

Preparations And Dose

Hydrargyrum cum creta (contains 1 part of the metal to 2 of prepared chalk, rubbed together until globules cease to be visible): dose, for children, 1/2 to 2 gr., less or more; for adults, 3 to 8 gr., or less. Pilula hydrargyri (contains 2 parts of the metal with 3 of confection of roses, and 1 of powdered liquorice root): dose, as a purgative, 3 to 10 gr.; for constitutional effects, 2 to 3 gr. three times daily- may be well combined with quinine. Emplastrum hydrargyri (made with mercury, olive-oil, sulphur, and lead plaster). Emplastrum ammoniaci cum hydrargyro (contains gum ammoniac in place of lead plaster, or, in other words, ammoniacum and mercury plaster). An emplastrum mer-curiale of the Prussian pharmacy is much used by Hebra and others in the treatment of syphilides, acne, etc., and is made according to the following formula: - R. Mercury 3 iij., turpentine 3 iss., lead plaster 3 xij. Unguentum hydrargyri (contains 1 part of mercury, 1 of prepared lard, and a little suet): this preparation should be lead-colored; from 1/2 to 2 dr. may be rubbed into the arm-pit or inner side of the thigh at one or several frictions in the course of the day, according to the rapidity of the effect desired. A pleasanter compound than the officinal ointment may be prepared from the following formula of Magne Lehrens, of Toulouse: Mercury 1,000 grammes, oil of sweet almonds 20 grammes, balsam of Peru 20 grammes, lard 960 grammes. The metal disappears rapidly in the oil and balsam, and the result is a smooth pomade, blue, agreeable in odor, and easily kept. Mr. Marshall's formula for oleates, already mentioned, is designed to prevent some of the unpleasantness of the ordinary blue ointment, and the following form, used in the marine hospital of Toulon, is calculated to produce constitutional effects without salivation: - R. Slaked lime gr. xxx., chloride of ammonium gr. viij., sulphur gr. xxx., mercurial ointment gr. clxxx. This ointment dries very readily, and is prescribed in double the ordinary quantity. Hydrargyri oleas: made 5 to 10 per cent. and upward (v. p. 209). Unguentum hydrargyri compositum (contains mercurial ointment, yellow wax, and olive-oil and camphor): this combines the medicinal properties of mercurial ointment and camphor, to which wax and oil are added to give a suitable consistence; it is used as a stimulant to swollen glands, and for chronic inflammation of joints, and represents "Scott's ointment." Linimentum hydrargyri (contains equal parts of blue ointment, solution of ammonia, and camphor liniment): it should be a lead-colored cream; this readily produces salivation. Suppositoria hydrargyri (contain mercurial ointment, benzoated lard, white wax, and oil of theobroma): there are 5 gr. of blue ointment in each suppository.

Hydrargyri subchloridum: dose, as a purgative, for children, 2 to 3 gr.; for adults, 2 to 5 gr.; for constitutional effects 1/2 to 1 gr. or more, frequently repeated, or 1/12 gr. may be given every hour (3 to 4 gr. in this manner sometimes produce mercurial action), or 1/4 to 1/2 gr. or more may be given night and morning combined with a fractional quantity of opium. Lotio hydrargyri nigra (contains 3 gr. of calomel to the ounce of lime-water). Pilula hydrargyri subchloridi composita - Plummer's pill (contains calomel, sulphurated antimony, guaiac resin, and castor-oil): each 5 gr. of the pill mass contains 1 gr. of calomel and 1 gr. of sulphurated antimony; calomel should not be given with alkaline carbonates, as corrosive sublimate is liable to be formed. Unguentum hydrargyri subchloridi (6 1/2 gr. of this ointment contain 1 gr. of calomel). Hydrargyri per-chloridum: dose, 1/20 to 1/4 gr. in solution or in pill: but very much smaller doses are used. Liquor hydrargyri perchloridi (contains 1/2 gr. of per-chloride and 1/2 gr. of ammonium chloride to each fluid ounce, or 1/16 gr. of each to the drachm): dose, 1/2 to 2 dr., i.e., 1/32 to 1/8 gr., but I prefer smaller doses, as mentioned above. Lotio hydrargyri flava (contains 18 gr. of corrosive sublimate in 10 oz. of lime-water).

Hydrargyrum ammoniatum ("white precipitate"): not used internally. Unguentum hydrargyri ammoniati: 1 part of ammoniated mercury in 8 of ointment.

Hydrargyri iodidum viride: dose, 1/2 to 3 gr. Hydrargyri iodidum rubrum: dose, 1/16 to 1/8 gr., or less or more. Unguentum hydrargyri iodidi rubri: 1 part in 28 of ointment.

Hydrargyri oxidum flavum: used in the preparation of the oleate of mercury. Hydrargyri oxidum rubrum: for external use. Unguentum hydrargyri oxidi rubri (contains red oxide of mercury, yellow wax, and oil of almonds): there is about 1 gr. of red oxide in 8 gr. of the ointment.

Hydrargyri nitratis liquor acidus: used externally. Unguentum hydrargyri nitratis (citrine ointment): 1 part in 15 1/2.

Hydrargyri sulphuretum - "artificial cinnabar" (not officinal): not used internally. Its fumes are used in syphilitic skin diseases, as ecthyma; also in syphilitic sore throat by inhalation, 30 gr. being heated on an iron plate and placed under the patient, who should be wrapped in a blanket; or the vapor may be inhaled through a funnel. Hydrargyri sulphas: not given as a remedy, but used in the preparation of corrosive sublimate and calomel.

[Preparations, U. S. P. - Hydrargyrum; Hydrargyrum cum creta

(mercury 3 parts, prepared chalk 5 parts); Emplastrum hydrargyri; Piluloe hydrargyri: mercury 384 gr., confection of rose 576 gr., liquorice-root 92 gr.; make 384 pills; Unguentun hydrargyri (mercury 2 parts, lard, suet, each 1 part); Hydrargyrum ammoniatum (white precipitate); Unguentum hydrargyri ammoniati: ammoniated mercury 40 gr., ointment 1 troyounce; Hydrargyri chloridum corrosivum; Hydrargyri chloridum mite (calomel); Hydrargyri cyanidum: dose, 1/16 to 1/8 gr.; Hydrargyri iodidum rubrum; Unguentum hydrargyri iodidi rubri: red iodide of mercury 60 gr., ointment 420 gr.; Hydrargyri iodidum viride (protiodide); Liquor hydrargyri nitratis; Unguentum hydrargyri nitra-tis (citrine ointment); Hydrargyri oxidum flavum; Unguentum hydrargyri oxidiflavi: yellow oxide of mercury 60 gr., ointment 420 gr.; Hydrargyri oxidum rubrum (red precipitate); Unguentum hydrargyri oxidi rubri: red oxide of mercury 60 gr., ointment 420 gr.; Hydrargyri sulphas flava (Turpeth mineral); Hydrargyri sulphuretum rubrum.]