J Exp MedJ. Exp. MedThe Journal of Experimental Medicine0022-10071540-9538The Rockefeller University Press198696022131607ArticleBLOOD AND BONE MARROW CELLS OF THE DOMESTIC FOWLForknerClaude E.From the Laboratories of The Rockefeller Institute for Medical Research30619295011211412441929Copyright © Copyright, 1929, by The Rockefeller Institute for Medical Research New YorkThis article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).

1. A simple, direct method of counting leucocytes of the fowl is described. 2. Twenty-nine complete, morphological studies of the blood of eleven domestic fowls are recorded. 3. The characteristics of the cells found in the blood and bone marrow are described in detail and their relative numbers reported. 4. The supravital technique, using neutral red and Janus green, enables one to separate and classify accurately the confusing cells of the blood and bone marrow. 5. These studies provide a basis for future experimental studies on the blood and bone marrow cells of the fowl.