. Elements of applied microscopy. A text-book for beginners. Microscopy. 148 ELEMENTS OF APPLIED MICROSCOPY. are diverse and striking. In some cases the mixture of the two materials remains Hquid longer han the pure substances, on each side, forming a clear area in which, later, an amorphous precipitate is deposited. The chlo- rides of iodin and silver exhibit this case to perfection (Fig. 56). Or a crystalline precipitate different from. a. b. c. Fig. 56.—Contact Zone between Chlorides of Silver and Iodin. (After Lehmann.) either of the pure substances may form in the contact zone, as with si
. Elements of applied microscopy. A text-book for beginners. Microscopy. 148 ELEMENTS OF APPLIED MICROSCOPY. are diverse and striking. In some cases the mixture of the two materials remains Hquid longer han the pure substances, on each side, forming a clear area in which, later, an amorphous precipitate is deposited. The chlo- rides of iodin and silver exhibit this case to perfection (Fig. 56). Or a crystalline precipitate different from. a. b. c. Fig. 56.—Contact Zone between Chlorides of Silver and Iodin. (After Lehmann.) either of the pure substances may form in the contact zone, as with silver and potassium iodides. Or the crystals may grow across the line unchanged, forming a single homogeneous mass. This occurs with identical bodies and with isomorphous substances like dibrom- benzol and dichlorbenzol. Or the crystals may grow across the contact zone, but with spaces between them, due to the presence of impurities in one or other of the substances. Usually the habitus of the crystals in the impure substance will be somewhat changed. Pur&. dinitrotoluol and the same body containing paranitro- toluol exhibit this phenomenon. These four cases by no means exhaust the possible conditions of the contact zone, but they serve as types of some of the more striking ones,. 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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