At the outset of this work, attention is called to the relative infrequency of injuries of the larynx, owing to the protection afforded it by the inferior maxilla and because of its free mobility. Contrary to organic lesions, the functional disturbances, as shown in changes of the voice, are exceedingly numerous. The topics discussed are taken up in this order: 1. The functional disturbances without any objective lesion: Here are noted mutism (dumbness), stammering and aphonia. The general treatment consists of rest, fresh air, hydrotherapy, faradization, and sometimes sedatives or suggestions. Massage of the larynx and education of the voice by means of exercises also were employed. 2. Extrinsic lesions of the larynx: In a summary of the anatomy of the nerve supply of the larynx, attention is called to the well known fact that the same nerve (recurrent) supplies both the constrictors and the dilators, that is, antagonistic muscles;