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between 50"* and 75"* C. If soft paraffin, or mixtures of such with hard paraffin, are used for this purpose there is more or less danger that con- siderable quantities of the injected material are liquefied and pressed from the original locality into the surrounding tissues, and so into localities of less resistance. The danger from embolia and inflammations of some of the organs would thus be established. Moreover, the hard paraffin may easily and completely be removed in the case of individuals who cannot tolerate its application, which can not be said of soft parafllin. Pharm. Ztg., liii (1908', No. 31, 312 ; from Berl. Klin. Order Doxycycline Wschr., 1908, No. 9. Petroleum Ether Remarkable Behavior of a Certain Sample. Pro- fessor }ohn Marshall Order Doxycycline says that when commercial petroleum ether has been carefully re-distilled and the fraction between 20*^ and 50*^ C. is reserved for use, one is of the belief that no hydrocarbons non-volatile at room temperature are contained in the fraction, and this is usually demon- strated by evaporating a portion of the distillate at room temperature and observing whether any residue remains. A fraction from a commercial petroleum derived from the Pennsylvania oil field was so tested immedi- ately after distillation, no residue remaining from 200 Cc. of the fraction ; but on permitting the remaining portion of the distillate to stand 30 days at room temperature, exposed to diffiised sunlight, in a stoppered flask, with an air space of about a liter above the surface of the liquid, and Digitized by Google ISOTERPENES OF FLAWITZKY. 307 evaporating 200 Cc. of it at room temperature, and then over sulphuric acid, a yellowish^ cosmolin-like residue , weighing 0.0072 Gm., remained. The experiment was repeated with fresh portions of the same petroleum ether, with practically the same results, the 200 Cc. tested immediately after distillation leaving no weighable residue, while after ten days' stand- ing 0.0007 Gm. residue was obtained. In other cases described, after standing 215 days, 200 Cc. of the fraction yielded 0.0494 Gm. of cosmolin- like residue. The composition of these residues was not determined. Their origin may possibly be due to polymerization ; but it is very evident that a petroleum ether of this sort is not adapted for use in making ex- tractions. Amer. Journ. Pharm., July, 1907, 315-317. Benzene Determination of Carbon Bisulphide, L. Bay mentions that carbon bisulphide is frequently present as an impurity in commercial ben- zene. It may be detected and approximately determined by means of Liebermann and Seyewetz's reaction, Order Doxycycline precipitation as phenylhydrazine phenyl- sulpho-carbazinate [CS2(CaH5.NH.NH2)2]. Although this body is unstable in solution^ it is sufficiently permanent in the dry state to permit weighing, if performed at once. Precipitation is completed in two or three hours ; the precipitate is collected on counterpoised filters, washed free from excess of Order Doxycycline phenyl- hydrazine with pure benzene, dried in vacuo, and weighed quickly. The quantitative results obtained are a trifle high, in consequence of the presence of a trace of adherent phenylhydrazine. Pharm. Journ., April 4, 1908, 451 ; from Compt. rend., 146 (1908), 132. Benzol Detection in Alcohol, Holde and Winterfeld recommend the following practical method for the detection of small quantities of benzol in Order Doxycycline alcohol : 100 Cc. of the suspected alcohol are diluted with water to about 25 per cent, absolute alcohol, which occasions transient turbidity and a distinct odor of benzol, not observable Order Doxycycline before, is developed. On subjecting the mixture to distillation, diluting the first 10 Cc. of distillate obtained with 10-20 Cc. of water, and cooling this mixture with ice, any benzol present in the original sample taken will float upon the surface as an oily liquid, the volume of which may be approximately ascertained if a graduated vessel is used as receiver. Pharm. Ztg., liii (1908), No. 28, 279 ; from Chem. Ztg., 1908, No. 25. Isoterpenes of Flawitzky Identity with the Hydrocarbons Designated as Limonenes. Edward Kremers observes that possibly no chapter of Organic Chemistry has suffered more from a confusion of names and synonyms than has the one commonly comprised under the designation of terpenes and camphors. Though one would scarcely expect that the isoterpenes of Flawitzky could have contributed to this condition, they do not appear to have found their place in the fairly well regulated classi- fication of these compounds at the present time probably because the **Terpene Hydrate" and " Isoterpenene " of Flawitzky have not been re- Digitized by Google 3o8 REPORT ON THE PROGRESS OF PHARMACY. garded as sufficiently characterized to place them beyond reasonable doubt. With the object of clearing up their identity, Kreraers reviews the work of Flawitzky, which is supplemented by work on the same subject carried out under his direction in the laboratory of the University of Wis- consin, in 1893. Flawitzky began his investigations along this line in 1879 on the laevogyrate modifications, and concluded them in 1885 on the dextrogyrate modifications. The changes brought about are briefly as fol- lows : Dextropinene Order Doxycycline obtained from Russian oil of turpentine, and laevo- pinene from French oil of turpentine were hydrated by means of dilute alcoholic sulphuric acid, and the hydrates were then dehydrated by means of acetic acid anhydride. His investigations of the products obtained led to the conclusion that the isomerides of the two terpenes bore a close relationship to the hydrocarbons designated as limonenes, viz. ; " laevo- isoterpene" to " 1-limonene," from elemi; " dextro-isoterpene " to " d-limonene," from lemon oil ; and, furthermore, that the Order Doxycycline isoterpenes obtained by the isomerization of these terpenes are distinguished from the natural isoterpenes only by a larger or smaller content of inactive isoter- penes. These conclusions have been confirmed chemically by the supple- mentary investigations conducted under the direction of Kremers, which are described in detail in the present paper. Pharro. Rev., April, 1908, 102-106. The Volatile Oils, igoi-igoj is the title under which j. W. Brandel, in a series of papers reviews the work done on volatile oils during the period indicated, which is intended to fill the gap between the 1900 and 1904 edition of "The Volatile Oils" of Gildermeister and Hoffman (Kremers^, and may Order Doxycycline be consulted in Pharm. Rev., r907. No. 10 (pp. 296-298), No.. 12 (pp. 362-366), and 1908, No. 2 (pp. 56-64), and No. 3 Order Doxycycline (pp. 88-96). Volatile Oils Optical Rotation, L. H. Bemegau mentions a number of volatile oils coriander, Order Doxycycline thyme, orange, anise which stood the U. S. P.
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