Reports of proved cases of primary infection of the maxillary sinus by fungi are scant, and primary infection by one of the Bacteroides has not been noted. Because of these facts and because of the excellent results obtained from the use of penicillin, the following case is reported. REPORT OF A CASE On Jan. 5, 1944, a 32 year old soldier in service for six months presented himself with the following complaints: recurrent sore throats, "stuffing" of the nose, postnasal drip and a feeling of "stuffing" in the ears. These complaints had been present since his induction into the service. Before being drafted he had worked as a cigar store clerk in Philadelphia. Physical examination revealed a congested and edematous nasal mucosa, impingement of the right vomer ridge of the nasal septum on the right middle turbinate and normal transillumination of the paranasal sinuses. The diagnosis at this time was