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This thesis, from the service of Professor Guillain at the Salpêtrière, consists in a study of paralysis of the nerves at one side of the brain with particular emphasis on cases in which the involvement of the nerve is the most extensive. Thirty-eight instances are collected, of which seven are reported for the first time. The literature seems to have been covered thoroughly, and the clinical description of the cases is excellent. The etiology of the condition is usually neoplastic, but instances of basilar meningitis, and even of polyneuritis, are occasionally encountered. The tumor may be extracranial, but is usually of meningeal origin. Sometimes an infiltrating tumor of the brain stem will provoke widespread unilateral paralysis.
In addition to the complete unilateral paralyses mentioned, there are a number of partial paralyses, of which the author gives the following list: syndrome of the sphenoidal fissure, syndrome of the external wall of