Acute tonsillitis is an acute infectious and often a contagious disease characterized pathologically by inflammation of the tonsils. Some authors differentiate between follicular tonsillitis in which the crypts or lacunæ are involved, and parenchymatous tonsillitis in which the parenchyma is involved. =Etiology.=—The predisposing and exciting causes are the same as in other acute infections of the upper air passages except that there is usually a chronic tonsillitis as a result of some previous attack. =Symptoms and Diagnosis.=—The symptoms also are similar to other acute infections of the nasopharyngeal tract, with sore throat, variable temperature, headache, etc. By direct examination of the pharynx, the protruding masses with white or yellow patches are readily seen. =Treatment.=—Infection, drainage and elimination are three words inseparable in the therapeutics. The local treatment (I doubt if many will agree) in either acute or chronic tonsillitis is essentially the same—radical aspiration drainage. In all cases, except young children who will not permit it, I place a vacuum cup directly over the tonsil and apply as much vacuum as can be obtained. This treatment will, when properly done, empty the crypts of all pus. This accomplished, each crypt is probed with a cotton applicator dipped into phenol-glycerine. Cervical and upper thoracic treatment and deep relaxation of the sub-tonsil tissues to increase the normal blood supply and to decrease congestion by drainage elimination are essential. The lower thoracic and lumbar should receive due attention for the purpose of increasing general elimination. The diet and other treatment are no different from that in other infectious fevers. Peritonsillar Abscess (Quinsy Sore Throat.) Peritonsillar abscess results from the collection of pyogenic bacteria and pus formation between the tonsil and the pillars of the fauces. It is perhaps a result of the closing of an infected crypt causing deep penetration of the pus. =Diagnosis.=—The symptoms are those of acute tonsillitis but usually more marked and with one tonsil decidedly more protruding than the other. In some cases the location of the abscess can be seen and it is comparatively easy to open with a knife or probe, but in many cases the abscess is so situated that it cannot be located except by exploratory probing.