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hours and a veritable honey-comb design is outlined by the vessels, a small number only of which seem to be completely open to the circulation. There are very many developing red bloodcells, all within strands of endothelium. In some places it appears almost as though the endothelium were being actually replaced by a strand of developing red blood-cells, though the regularity and continuity of outline is nowhere broken. There are numerous small groups of from five to eight young granulocytes in various stages of development, all located extravascularly in the parenchyma. Succeeding stages increase the complexity of the picture. However, insofar as we have been able to observe, the red blood-cells have appeared only intravascularly, and the white blood-cells extravascularly. No analyses of hyperplastic marrows have as yet been attempted.