. Elements of applied microscopy. A text-book for beginners. Microscopy. 144 ELEMENTS OF APPLIED MICROSCOPY. from a warm, aqueous solution, large, tabular, mono- symmetric (rhombic) crystals form. If, now, the slide be quickly heated by the application of a small flame, the large plates fall to pieces, and minute crystals of the anhydrous salt appear in their place (Fig. 53). On cooling, the small crystals take up water and run together in their original Fig. 53.—Crystals of Hydrous and Anhydrous Ferrous CHLORroE. (After Lehmann.) Behrens and other authors give a large number of specifi
. Elements of applied microscopy. A text-book for beginners. Microscopy. 144 ELEMENTS OF APPLIED MICROSCOPY. from a warm, aqueous solution, large, tabular, mono- symmetric (rhombic) crystals form. If, now, the slide be quickly heated by the application of a small flame, the large plates fall to pieces, and minute crystals of the anhydrous salt appear in their place (Fig. 53). On cooling, the small crystals take up water and run together in their original Fig. 53.—Crystals of Hydrous and Anhydrous Ferrous CHLORroE. (After Lehmann.) Behrens and other authors give a large number of specific microchemical tests, some of which the student should make in order to gain practice in the recognition of typical crystalline forms. Aluminium, for example, may be easily detected in a solution by evaporating with a small drop of sulphuric acid, dissolving the residue in water, and adding a grain of caesium chloride. Large, colorless, isometric octahedra of caesium alum are pro- duced, or, if more than 1% of aluminium sulphate be pres- ent, rectangular dendrites sprout from the caesium salt (Fig. 54). Calcium is best tested for by precipitation with sul-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Winslow, C. -E. A. (Charles-Edward Amory), 1877-1957. New York, J. Wiley; London, Chapman & Hall
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