Practical pharmacy; an account of the methods of manufacturing and dispensing pharmaceutical preparations; with a chapter on the analysis of urine - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1898 Excerpt: ...with three times its volume of 70 percent. alcohol. Constituents.--The principal point of difference between the English and French oils is the variation of ester and cineol percentages. The finest French oils contain from 30 to 40 per cent. of esters (principally linalyl acetate), and the estimation of the ester content is the most useful means of comparing this class of lavender oils, and ensuring freedom from oil of spike. Spike oils contain practically no esters, and reduce the ester percentage proportionately to their presence. English oils only contain from 7 to 10 per cent. of esters (also principally linalyl acetate), and attempts to discredit the English oil on this account have been frequently made on the Continent. Cineol (see Oil of eucalyptus) is also present in very considerable quantity in English oils, and gives to it its characteristic pungency; mere traces are present in the French oils. Other differences in constituents and their proportions doubtless exist, which may help to make up for the great variability in odour. Oleum Limonis Source.--Obtained by expression from the fresh peel of the fruit of Citrus Km avium in Sicily, the two centres for export being Messina and Palermo. Characters.--Pale yellow, with the fragrant odour of the lemon and a warm, bitterish taste. The odour of the Messina oil is slightly different from that of the Palermo variety; and whilst the latter is preferred in this country, on account of its fine flavour, for aerated water manufacture, the former is principally employed on the Continent, where it is used in perfumery. Specific gravity at 15 C. from "857 to-860. Optical rotation not less than + 60. Adulteration with turpentine reduces this figure according to the degree of sophistication. Fractionation.--...
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