_Spleen._--The structure was well preserved, the capsule thin. The Malpighian bodies were normal as to the elements of which they consist. Cells with pycnotic nuclei were scattered throughout the organ, and vesicular cells with small, deeply stained, excentrically located nuclei were present. Polymorphonuclears were found in the tissue in considerable numbers. No localized necrotic foci could be found in sections through the spleen. _Cervical Glands._--The blood-vessels were considerably distended. A few hemorrhages and polymorphonuclears were present. Œdema of the capsules and surrounding tissue existed. Part of the gland was necrotic. _Lungs._--The blood-vessels were distended. The alveoli contained homogeneous masses and blood. There were numerous subpleural hemorrhages. The bronchi were collapsed, and contained mucus. _Kidneys._--The cortical part showed subdued structure; the epithelial cells had an indefinite outline and occasionally showed vacuolization. The medullar part was better preserved. There were miliary subcapsular hemorrhages. A few small foci were scattered throughout both medullar and cortical parts. They consisted of round-cell infiltration. NATURAL PLAGUE INFECTION IN A CAT The experiments of the German Plague Commission proved that cats showed considerable resistance to plague infection as cutaneous and subcutaneous inoculations failed to infect them. According to the Austrian Commission, cats develop submaxillary buboes if fed on plague material. They are said by Albrecht and Gohn[13] sometimes to recover. Out of four cats fed on plague material two died of plague, one showing submaxillary, the other mesenterial buboes. Virulent plague bacilli were found in the discharge from the nose and also in the fæces of cats which apparently did not become infected after having been fed on plague material. [13] Über die Beulenpest in Bombay im Jahre 1897 (1897), II B, II C. One case of spontaneous plague infection of a cat was recorded by Thompson[14] in Sydney. [14] Report of an outbreak in Sydney, 1900. Referred to in Kolle and Wassermann (1903), =2=, 510. W. Hunter,[15] in Hongkong made observations on cats suffering from plague infection. The author also undertook a few experiments, and arrived at the following conclusions: 1. Cats suffer from plague. 2. The disease may be acute or chronic. 3. The type of the disease is septicæmic. 4. The animals may occasionally play a part in the dissemination of plague. 5. In plague-infected areas cats probably become infected through rats, which they devour as food. 6. In plague-infected districts possible plague infection in cats is of great importance from a domestic point of view. [15] Lancet (1905), =I=, 1064.