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The following dyes have been carefully purified for use as vital stains. In ordering, vital should always be specified.

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HYDROGEN ION INDICATORS

A complete bibliography on Hydrogen Ion determinations may be found in the "Table of Рн, H+ and OH- Values corresponding to Electromotive Forces Determined in Hydrogen Electrode Measurements, with a Bibliography," by Carl L. A. Schmidt and D. R. Hoagland, University of California Publications in Physiology, 1919, Vol. V, No. 4. The most recent and exhaustive discussion of the entire subject of the Determination of Hydrogen Ions will be found in the book of that title by William Mansfield Clark, published by Williams and Wilkins Company.

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