=Symptoms.= The symptoms consist in loss of appetite, or rather in difficulty in grasping and masticating food, wasting, a certain degree of dulness, and salivation. Somewhat later one often sees appear on the free margin of the upper and lower lips an eruption of small vesico-pustules, which quickly become covered with yellowish-brown crusts and bleed on the slightest touch. The lips swell, become sensitive and painful, so that examination of the cavity of the mouth should be made with care. The mucous membrane is then seen to present a very varying number of greyish-white or greyish-brown points, each of which is due to the destruction of the epithelium and to the production of a pultaceous deposit, which can very readily be removed, leaving uncovered superficial ulcerations, which bleed if very lightly touched. These ulcerations are of irregular shape, and are distributed most freely over the gums, the internal surface of the lips and cheeks. The palate and tongue are only invaded in the last stages. Still later one notes, instead of these ulcerations and as a consequence of abnormalities in the process of repair, reddish-violet turgid vegetations varying in size from that of a millet seed to that of a pepper-corn or even of a small mulberry. The total duration of the disease varies with its degree of intensity. In favourable cases it may not exceed eight to ten days; in grave cases it continues for fifteen to twenty days. Recovery is usual when the subjects are vigorous and well-nourished lambs, or well-kept sheep, previously free of disease. On the other hand, Moussu has noted a mortality of 15 to 20 per cent. in thin animals of bad bodily condition and already depressed by verminous broncho-pneumonia and intestinal helminthiasis. When the attack is about to prove fatal, complications such as gastro-enteritis, resulting from septic infection or intoxication, and accompanied by fœtid diarrhœa, often make their appearance. =Diagnosis.= The diagnosis presents no difficulty, the characteristics of this stomatitis being entirely different from those of the aphthous form. The claws are never affected, and there is no lameness. =Prognosis.= In this connection the practitioner will do wisely to avoid committing himself, and to closely study the conditions under which the disease has developed. In all cases the appearance of fœtid diarrhœa must be regarded as of very unfavourable augury. =Treatment.= The first precaution to take consists in separating all the healthy animals in the flock, and placing them in a non-contaminated spot.