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It is desired to call attention to an error in the communication by Drs. Penfield and Young, "The Nature of Von Recklinghausen's Disease and the Tumors Associated with It," which appeared in the February issue (Arch. Neurol. & Psychiat. 23:320, 1930). Throughout the text perineurial fibroblastoma is referred to as perineural fibroblastoma. The term perineurial was first used by Mallory to point out that these tumors arise from the perineurial connective tissue sheath. The authors regret that the alteration was not perceived in reading the proof, but they consider it essential that the nomenclature should not be further complicated by a new term. The same error was made in Penfield's discussion on page 301 of the same issue, in which perineurial should be substituted for perinueral fibroblastoma.