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OXAL

product to the cool night air, and skimming off the fine oil that floatson the surface. It is brought to England chiefly as presents to per-sons of rank, in small square or round gilt bottles, each containingabout one ounce. The perfume is so fine, that the hundredth partof a drop on the point of a needle will perfume a pair of gloves whilethey last. By liquefying by means of heat, and dropping the ottoon loaf sugar and grinding it, the perfume may be very extensivelydiffused.Adulterated with oil of sandal-wood, spermaceti being added to imitatethe crystalline appearance of the genuine. The genuine is of a palegold colour, and of the consistency of Venice turpentine.Imitated in England by skimming the oil that is formed in the distilla-tion of rose water. This mixes well with oil of rhodium ; but, as itis usually mixed with water, it seldom keeps long, and soon becomesrancid.

Ourbtic Acid. This is only biphosphate of soda.

Ovum. L. P. The Egg of the barn-door Fowl, Phasianus gallus, or anyother egg, as all eggs have nearly the same properties.The while, or Albumen, is mucilaginous, emollient, nutritive, and theFrench say aphrodisiac. It is chiefly used for clarifying turbidliquors, which it does like isinglass, by forming a precipitating mem-brane, or mechanical filter. It blackens silver.The yolk, yelk, or vitellus, is also albuminous, and contains a pe-culiar oil. It is excellent in bilious and liver affections, wheneaten soft boiled, swallowed raw, or beat up with a little wine andwater. By living on raw eggs and a little bread, some hopeless casesof chronic hepatitis are said to have been cured. It is also somewhataperient when rubbed up with sugar, in form of emulsion. But itis chiefly used in pharmacy, for mixing oils and other substances withwater.The oil is prepared by beating the yolks of eggs in a silver vessel, eva-porating in a water-bath, and pressing out the oil between two ironplates, heated in boiling water. It is used to anoint chapped nipples,and to drop into the ears in deafness from deficiency of the wax. Itis the Oleum e vilcllis. P.The shells contain phosphate and carbonate of lime, and are reputed tobe vermifuge by old women.

Oxalates are combinations of alkaline or metallic bases with oxalicacid, such as oxalate of potass, and oxalate of iron. The oxalates oflime, magnesia, and barytes, are nearly insoluble in water ; and hencelime water and magnesia are good antidotes for oxalic acid. Oxalateof lime is the basis of the mulberry calculus.

Oxalate of Ammonia is an excellent test of lime, which it readily