Abstract
Summary
Eosinophil counts were made on tail blood obtained at two times of day from male Line 3 Black rats kept under standardized circumstances and subjected either to splenectomy or to a sham-operation. Eosinophilia was seen to develop during the first few months after operation and to regress during the fourth month after operation. Irrespective of the degree of eosinophilia, the mean eosinophil counts of the groups of rats studied were higher by day than by night. In the strain of rats studied, the presence of the spleen is not essential for the maintenance of the eosinophil rhythm.
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