Black Bear ♂ (_Ursus americanus_). Sacculate dilatation of esophagus with chronic esophagitis. Chronic hypertrophic gastritis. Chronic lymphadenitis. Fatty degeneration of liver. Acute catarrhal enteritis. Had been vomiting more or less, nearly every day for two months and did not eat for six days before death. Mouth, pharynx and esophagus are full of macerated, unrecognizable food. Pharynx seems normal. Larynx is yellow, mucosa rough and slightly thickened in places especially just above the vocal chords. No excess of mucus. Esophagus in neck is dilated. Mucosa is rough, irregular yellow brown. This dilatation proceeds downward so that at thoracic opening tube is twice normal size. Upon entering thorax this dilatation turns to right and in irregular saccular form extends to diaphragm compressing heart and lungs to left. The main course of it then recrosses the midline, aorta being slightly twisted as it regains position in front of vertebræ. The wall is irregularly thickened from pseudomembranous patches and some hypertrophy of mucous and submucous layers. Muscle and serous coats are considerably thinned. The sac is full of macerated food and gas. The right lung is compressed small resilient red gray. No adhesions in either pleura. On section the lung tissue is found to be slightly edematous, red gray, compact and while not atelectatic yet crepitates much less than normal. Left lung is the seat of passive congestion in lower lobe and lower half of upper lobe. The upper half of lobe is compressed and subcrepitant like the right lung. Lymph glands of neck and thorax are much enlarged firm with large irregular, clear outlined follicles and brown firm homogeneous pulp. The aorta shows slight roughening, the intima being smooth and homogeneous.