A New Supplement...: O. Ochre. Olympian green. Orfila's hair dye. Ossa. Ox-gall. Oxidum ferri nigrum. - rubrum. Oxidum Zinci impurum. -praeparatum.

A New Supplement to the latest Pharmacopoeias of London, Edinburgh, Dublin, and Paris, Forming A Complete Dispendatory, Conspectus, and Dictionary of Medical Chemistry, Giving All the Old and New Names, Including the New French and American Medicines, and Poisons; with Symptoms, Treatment, and Tests; as Well As Herbs, Drugs, Compounds, Veterinary Drugs, With the Pharmacopoia of the Vetenary College, Nostrums, Patent Medicines, Perfumery, Paints, Varnishes, And similar articles kept in the Shops; With Their Compositions, Imitations, Adulterations, And Medicinal Uses, Being a General Book of Formulæ and Recipes For Daily Reference in the Laboratory and at the Counter.
Fourth edition, corrected, improved, and very much enlarged.
By James Rennie, M. A., Editor of the Quarterly Journal of Foreign Medicine; the Pharmacopeia Universalis; Author of a Conspectus of Prescriptions in Medicine, Surgery, and Midwifery; the Pharmacopeia Imperialis, &c. &c.
London: Baldwin and Cradock. 1837.
London: Thomas Curson Hansard, Paternoster Row.

OCHRE. A general temp applied to pulverulent clays. It is nearly synonymous with the term BOLE. Red ochre, Brown ochre, Stone ochre, Yellow ochre, Oxfordochre, and Roman ochre are the chief, and ought to be chosen of a fine colour, as free from sandy or gritty matter as possible. The colours chiefly depend on the presence of an oxide of iron, or some other metal. Blue ochre is a subphosphate of iron, used a a good pigment, but not easily procured.

OLYMPIAN GREEN. A pigment containing copper.

ORFILA'S HAIR DYE. Plumbite of lime, made by boiling for an hour and a quarter 4 parts of sulphate of lead with 5 parts of slaked lime and 30 parts of water, filtering the liquor, and collecting the powder. This in a warm solution will dye the hair a fine black in one hour.

ORPIMENT, or King's Yellow, or Chinese Yellow, is the native sesqui-sulphuret of arsenic, and contains 38 parts of arsenic, and 24 of sulphur. It is also termed Rusma in old books.
Artificially it may be made by fusing together equal parts of arsenious acid and sulphur; and when wanted very pure by transmitting a current of sulphuretted hydrogen gas through a solution of arsenious acid.
Adulterated with ochres, and other substances, which generally impair the colour.
Used in painting, in dyeing yellows, and also to make fly water, for destroying flies. It forms the basis of all the depilatories, being extremely caustic.
Poisonous, producing all the ciolent symptoms of arsenical poisons. See ARSENIC.

OSSA. P. Bones used in preparing bone-black, and to adulterate harts-horn shavings.

OX-GALL. Fel bovinum. P. When fresh is bitter, antacid, and stomachic, in doses of m x x to m x x x. An extract may also be made by mixing it with water,boiling, and evaporating it to the consistence of extract. The dose is gr. iij. to gr. viij twice a day. Externally it is cosmetic.
The extract is used by painter to mix with their colours, to destroy their greasiness, and to wash tracing paper, to make it bear ink; and ivory, to make it take on colours: by scourers in taking out grease spots.

OXIDUM FERRI NIGRUM: P. Black Oxidof Iron, or Æthiops martial. Take 500 parts of very pure sulphate of soda, 4000 parts of distilled water, dissolve the sulphate in the water, filter, and add gradually 500 parts of carbonate of soda, dissolve in 4000 parts of distilled water; wash the matter which is precipitated, and dry it with care; put to it a weak acid in the proportion of three to eight, place the mixture in a retort, distil, and leave the residue, which is the oxide, to cool.
Medicinally it is tonic, astringent, and deobstruent; but is not much used.

OXIDUM FERRI RUBRUM. E. D. P. Red Oxide of Iron. Colcothar, or Ferrum vitriolatum ustum. O. Exposes sulphate of iron to an intense heat, till it becomes red. The Dublin college orders it to be washed, and dried on blotting-paper.
Chemically it is a peroxide of iron, the sulphuric acid being driven off by the heat. When it is not washed, however, it retaqins a portion of the sulphate.
Medicinally it is astringent, styptic, tonic, and stimulant. It is applied externally, in form of powder, to atonic ulcers, and internallly in doses of gr. v to gr. x, but seldom prescribed.
Enters into Murias Ammoniæ et Ferri. E. D.

OXIDUM ZINCI IMPURUM. E. D. Impure Oxide of Zinc, or Tutty. It is sublimed in roasting the ores of zinc with those of lead. It usually contains clay, and other oxides.
Medicinally it is used as a styptic and astringent, in form of ointment and liniment.
Enters into Oxid. Zinci Impurum Præp. E. Ung. Oxidi Zinci Impuri. E. D.

OXIDUM ZINCI IMPURUM PRÆPARATUM. E. It is prepared like the preceding, and has similar properties.