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To the Editor:
—In referring to my views on the source of the cerebrospinal fluid, Dr. Frank Fremont-Smith (Arch. Neurol. & Psychiat.17:317 [March] 1927) made some erroneous and misleading statements which I feel must be corrected. He states: "The following is an example of the type of evidence, derived from pathologic studies that he (Hassin) offers to support his contention (that the choroid plexus does not produce the cerebrospinal fluid): A case of carcinoma of the breast showed diffuse carcinomatosis of the meninges and a mass of carcinoma cells in the choroid plexus." This "type of evidence" was not offered by me. The choroid plexus changes to which Dr. Fremont-Smith refers were described, jointly with Singer, in a case of cerebral carcinoma (Histopathology of Cerebral Carcinoma, Arch. Neurol. & Psychiat.8:155 [Aug.] 1922), while the "diffuse carcinomatosis of the meninges" was from a different case described in