The following is taken from a resume of Dr. Bjeljakow in the “Wjestnik Psych.” (viii. Jahrgang, Heft 2), as given in the “Allgemeine Zeitschrift für Psychatrie” (xviii. Band, 1 Heft). Dr. Bjeljakow, who has studied the subject in a hospital of St. Petersburg, has confined his observations to cases where there was distinct inflammation of the middle ear. Out of 135 post-mortem examinations which he made during four years 17·12 per cent. suffered from internal otitis. Of these one of the patients had melancholia, one paranoia hallucinatoria acuta, eight paranoia hallucinatoria chronica, two secondary dementia, three epileptic insanity, four general paralysis, one acute delirium, one senile dementia, and three hebephrenia. The author, at the end of his paper, gives the following conclusions:—