21.--The cough was small, difficult, and painful, producing an expectoration of violet-coloured matter, approaching to chocolate, _with a characteristic odour_. 22 to 25.--Expectoration and breath emit an _intolerable stench_. On the latter day the patient died. _Examination._--The body not emaciated. Strong adhesions of the left lung to pleura costalis. At its posterior part a large gangrenous layer, occupying the two superior thirds of the lung, covered at some points by a false membrane. The lower third, and the parts round the gangrenous portion, in different degrees of inflammation, and hepatised; the putrid mass was in great part black or violet-coloured, containing fragments of the pulmonary texture; the smell gangrenous, but less so than that of the breath during life; pus might be squeezed from the adjacent part of the lung. CASE II.--A man, aged 55, enjoyed good health till the beginning of May, at which time he experienced pain in the left side of the thorax after exposure to cold. During the next few days the cough was frequent, and the expectoration tinged with blood. A rigor now came on, followed by a distinct exacerbation of fever, and he came to the Hôtel Dieu. At this time he presented symptoms of inflammation of the lungs, and was bled with relief; he left the hospital in twelve days, being sufficiently well to resume his occupation. Scarcely had he done this, however, when he had a relapse, accompanied by great lassitude, oppression of breathing, and frequent cough. At the end of a week he returned. He was now at the twenty-first day of the attack. His skin was yellowish; face pale or of leaden hue, and greatly altered; his cough frequent, with abundant expectoration of matter like chocolate, with small specks resembling pus, and little bodies about the size of peas, which appeared to be portions of the lung. This putrid mass exhaled a _gangrenous odour_, and the expired air was impregnated in a high degree with an equally disgusting smell, which surrounded the patient's bed with a contaminated atmosphere. Percussion gave a clear sound over the whole extent of the chest; auscultation did not discover the pulmonary expansion on the right side. The pulse was weak, but not frequent; the patient was in a state of extreme prostration. Next day the odour of the breath and expectoration was, if possible, more dreadful. He lingered two days longer, during which time the fœtid smell somewhat diminished, and the proportion of pus in the expectoration increased.