Abstract
The inflammatory reaction of Catostomus commersoni to the parasites Actinobdella inequiannulata and Lernea cyprinacea, and to an experimental incision, produced tissue that contained large numbers of eosinophilic granulocytes. The cells had spherical nuclei and orange granular cytoplasm after H & E staining. In imprints of the same tissue treated with Romanowsky stains the cells had a flocculent weakly basophilic cytoplasm and sometimes contained purple granules. They were peroxidase negative. "Finely reticular cells" found in the blood had an identical appearance to the cells observed in the imprints, and were thought to be the same type of cell. They may be equivalent to mammalian eosinophils.
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