American journal of pharmacy . the rJiaponticiim exhibits a distinctly salmon-red shade. Canaigre with the same reagent gives a brownish apply the test, place upon a glass surface a small amount of pow-der, and moisten it with a drop or two of ordinary ammonia once the color reaction becomes apparent. A mixture of thetwo rhubarbs cannot thus be detected, as the pink of the rhaponti-cinn is masked by the stronger yellow of the Chinese variety. The Am. Jour. Iliiirin. i Ilic Kliubarbs and a Probuhle Adulterant. 35 stronger alkalis did not afford satisfactory result
American journal of pharmacy . the rJiaponticiim exhibits a distinctly salmon-red shade. Canaigre with the same reagent gives a brownish apply the test, place upon a glass surface a small amount of pow-der, and moisten it with a drop or two of ordinary ammonia once the color reaction becomes apparent. A mixture of thetwo rhubarbs cannot thus be detected, as the pink of the rhaponti-cinn is masked by the stronger yellow of the Chinese variety. The Am. Jour. Iliiirin. i Ilic Kliubarbs and a Probuhle Adulterant. 35 stronger alkalis did not afford satisfactory results, since they formed a(gelatinous mass with the powders that did not show the colors , then, the authors results indicate the following facts, viz:That the characteristic elements of the powdered rhubarb are thestarch grains, calcium oxalate crystals, and massed acicular crystalsof chrysophanic acid, and that these are so similar in the two formsthat no point of distinction is offered by them. Also, that the reac-. FiG. 7.—Rumex Hymenosepalus, x 450 diameters, a, starch ; b, fragmentsof pitted vessel ; c, parenchyma cells. tion to ammonia serves as a means of identifying the pure specimens,but not mixtures. And, finally, that adulteration with canaigremay be detected by the presence of the characteristic long starchgrains. Before making any suggestions as to the manner in which thetext of the describing rhubarb may be changed so that pow-dered rhubarb may be clearly identified, the author desires to makefurther study of the subject. He v/ould gladly receive the co-op-eration in this work of any who are interested. SeleniuDi has recently been employed for producing colored glass. Rose-tinted glass is made by adding selenium directly to the ingredients in the melt-ing-pot, the depth of tint depending on the quantity used and upon the char-acter of the glass—whether hard or soft. ! V Analysis of Licorice Mass. ^ METHOD OF ANALYSIS OF LICORICK MASS
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