The various types of polyneuritis may be classified in many ways. Usually, cases have been described from either the clinical or the pathologic point of view, but it seems best, with our extended knowledge of the causes of this large group of cases, to limit our groupings as far as possible on an etiologic basis. Harris1has done much to clarify our view on the subject by making five general groups as follows: 1. External poisons (lead, alcohol, etc.). 2. Autotoxemic (diabetes, beriberi, etc.). 3. Infective (diphtheria, typhoid, etc.). 4. Cachectic (chronic anemia, malignant disease, etc.). 5. Familial (certain muscular dystrophies). In addition to the usual motor and sensory paralysis of the extremities, generally symmetrical, involvement of the cranial nerves may be found in many of these various types. However, if we limit the cranial nerves to the seventh pair, we find that most of the cases fall into