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Part of the material of this paper was given in an address before the Philadelphia Laryngologic Society, March 5, 1940, under the title, “The Circulation of the Head, Especially Venous, with Reference to Osteomyelitis, Brain Abscess and Malignant Metastasis.” Part was also presented before the Philadelphia Neurologic Society, March 22, 1940, under the title, “The Cerebrospinal Veins.”