Yearbook of pharmacy Author:Unknown Author Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: PART I [I. NOTES AND FORMULA. Observations on the Nature of Phosphorescence. H. Jackson. (Jonrn. Cham. Soc., 1894, i. 734.) It is sbovvii that the brillian... more »cy of phosphorescent compounds is influenced by the method adopted in their preparation. Thus, lime prepared from pure precipitated calcium carbonate in the crystalline condition was strongly phosphorescent, but when the carbonate was rapidly heated while in the amorphous condition, the lime obtained from it hardly glowed at all. Similarly variable results were obtained in the case of barium carbonate, and it would, therefore, appear that " according to the conditions of its preparation, an apparently pure substance may or may not phosphoresce, or the colour of its glow may not always represent rays of the same range of wave-length." Corrosion of Aluminium. A. Liver si dge. (Chemical Newt, March 15th, 1895.) The author finds that though chemically pure aluminium remains perfectly bright when exposed to air and moisture, the commercial metal, of even the best quality, soon becomes tarnished by superficial oxidation, and therefore does not deserve the reputation for permanence which is generally accorded to it. Protection of Iron against Rust. (From Amer. Drugg. awl Pliann. liec.) The surface of the iron is coated with a mixture of solution of tannin, and of some mucilaginous substance (such as dextrin, acacia, etc.), before applying any ordinary paint. Simple Substitute for a Separator Funnel. D. Holde. (Zeitschr. fiir analijt. Chem., 189o, xxxiv. 54.) An ordinary bottle or flask is fitted with a cork, through which pass two tubes. One of these, terminating inside level with the cork, is furnished with a stop-cock or pinch-clamp. The other, reaching to the bottom of the vessel, is there narrowed to a point, and ser...« less