As the process advanced the appearance of the lung changed from deep red to yellowish red and finally to a quite yellowish gray color, still retaining, however, the very moist characters. The fluid found in the lung changed its consistency from the thin red type to a sticky, glairy variety which could be pulled out in long strings. It was noted that the change in the character of the fluid was accompanied by similar changes in the lung structure, advancing in two cases to abscess formation of a grape-bunch type. Here there was a rather extensive necrosis and cavitation of lung substance in communication with the bronchioles. However, there was also marked softening and necrosis of lung in a number of cases where abscesses did not develop, but the lesion was so advanced that the lung substance was almost diffluent. An accompaniment of these advanced cases were irregular yellow islands which appeared beneath the pleura. At times they reached the size of a circle 2 cm. in diameter and were slightly raised above the surrounding pleural surface. When these were opened they were found to be areas of softened lung substance. This reaction was so extensive in some lungs that it resembled to a degree the appearance of a caseous pneumonia. However, the former process appeared to be brought about by the interference with the lymphatic drainage, as it was not uncommon to see engorged yellow channels beneath the pleura as well as enlarged lymph nodes at some distance from the hilus. Another feature of the advanced cases were the plugs of ropy yellow material which were contained within the bronchioles, while in the early cases the bronchi and bronchioles showed intense congestion of the mucosa with blood-stained fluid in their lumina.