In classifying speech disorders, one differentiates three large groups: (1) those in which a lesion of the forebrain results chiefly in a disturbance of word comprehension; (2) those in which speech is affected in its motor component, and (3) those in which there is a defect of the purely mechanical, that is to say, muscular process of pronunciation although the comprehension and formation of the speech as an ingenious mental execution is absolutely normal. The nosologic classification under which these three groups of speech disorders are known includes sensory aphasia, motor aphasia and dysarthria. The names of Wernicke, Broca, Pierre Marie and Head are forever connected with knowledge of the pathology of speech. A large contemporary interest is directed toward the aphasias sensu strictiori, but comparatively little work has been done in the field of dysarthrias. Yet who as a neurologist has not noticed, in many a case of dysarthria,