The Eosinophil and Eosinophilia

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Abstract
It is some 96 years since Paul Ehrlich's pioneering cytohistologic studies defined the leukocyte whose granules could be distinguished by a characteristic taking up of stains of acid quality. One such stain, eosin, has subsequently served as a standard but not unique hematologic reagent for identification. However, it is only during recent years through the almost explosive ascendency of biochemical and immunologic research that the sophisticated investigative tools for a meaningful understanding of eosinophil-related mechanisms have become available. Two articles appearing in this issue of the Journal offer examples and evidence of the progression, effectiveness and productivity of ongoing investigations. . . .