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To the Editor:
—Dr. J. B. Hassin's Criticism of my paper "The Nature of the Cerebrospinal Fluid" (Arch. Neurol. & Psychiat.17:317 [March] 1927) has been referred to me for reply. It appears that I have confused a case of cerebral carcinoma with one of meningeal carcinoma, thereby misrepresenting Dr. Hassin in regard to these two cases. I apologize to Dr. Hassin for this mistake.The point I wished to make is that the presence of tumor cells in both the brain substance and the choroid plexus is not good evidence that the tumor cells were carried to the choroid plexus by the flow of cerebrospinal fluid, for such cells may have reached the choroid plexus by way of the blood stream. In describing a case of sarcoma of the brain in the. region of the third ventricle, in which the choroid plexuses of the lateral ventricles were infiltrated