Abstract
IN spite of the wealth of investigations carried out on the reticulo-endothelial system practically nothing has been reported on its activity and morphology in the embryo. Various workers have noted phagocytosis in early embryonic tissue, but there is divergence of opinion as to the extent and definition of the cells concerned. Recently, Kent1, using colloidal suspensions of ‘Thorotrast’ and of silver (silver-110), has made a valuable contribution to the knowledge of the appearance and phagocytic activity of macro-phage cells in the chick embryo, and it is to support this evidence further that the present findings are reported.
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