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To the Editor.—I have observed in the literature which mentions histologic methods for fixation of both human and animal temporal bones, that the name "Heidenhain-Susa" is used by a number of authors including myself, to indicate the fixative designed by Heidenhain. The name Heidenhain-Susa, however, may be interpreted, as usually is the case, as the fixative designed by the author Heidenhain-Susa or two authors, Heidenhain and Susa. The term "Susa" was an abbreviation used by Heidenhain to indicate "Sublimatäuregemisch", that is, mercuric chloride