Studies on Epidemic Influenza

Part 2 — EXPLANATION OF PLATES

Reading edition

Fig. i. Cyanosis of head and neck.

Fig. ii. Acute tracheitis with desquamation of epithelium and superficial necrosis.

Fig. iii. Acute serous and hemorrhagic pneumonia.

Fig. iv. Acute serous pneumonia with massive hemorrhage.

Fig. v. Acute hemorrhagic and purulent lobular pneumonia. The purulent process is seen to be advancing from the focal type to the more diffuse lobar by fusion of the neighboring lobules.

Fig. vi. Acute purulent pneumonia.

Fig. vii. Lobular fibrosing pneumonia. In this specimen the patches of new scar tissue formed irregular islands. The final stage of contraction of the scar had not taken place.

Fig. viii. Acute serous pneumonia with some infiltration by mononuclear cells.

Fig. ix. Acute hemorrhagic pneumonia.

Fig. x. Hyaline deposits upon alveolar walls. In some areas the wall itself has suffered necrosis.

Fig. xi. Acute purulent pneumonia. In other areas of the same lung the interstitial infiltration by leucocytes was more intense.

Fig. xii. Acute lymph adenitis, showing the unusual numbers of endothelial cells while leucocytes are relatively infrequent.

Fig. xiii. Rupture of abdominal rectus muscle with hemorrhage. The degeneration antecedent to the rupture is shown in the belly of the muscle.