Heretofore the only recognized seat of an herpetic inflammation on a cranial nerve was that of the Gasserian ganglion of the trifacial. Herpes zoster in the distribution of one or more of its branches was the result. I believe, however, that the geniculate ganglion situated in the depths of the internal auditory canal at the entrance to the Fallopian aqueduct may be the seat of this specific inflammation. . . . As was long ago pointed out by Barensprung and is now definitely established by the elaborate clinical and pathological researches of Head and Campbell, the primary or infectious form of herpes zoster is dependent upon a specific inflammation of one or more of the posterior spinal