Patients with continuous low grade fever lasting months or years who are otherwise physically well frequently present perplexing problems to the clinician. Even after prolonged fruitless investigation one hesitates in most cases of this nature to dismiss the matter lightly lest some unrecognized or occult lesion be present. Yet few physicians have the opportunity and few patients the time and money necessary for investigation and observation over long periods. The patient with such a condition often becomes dissatisfied with the negative results of repeated examinations by his own physician and commences a tour to a long series of physicians, as illustrated in the following reports of cases. As often happens, each physician approaches the case from a different point of view and arrives at a different conclusion, until the patient is alarmed by the array of suggested diagnostic possibilities and, if not already neurotic, may become so. Besides this the patient is often successively deprived of teeth,