PLATE VI.-Coagulation necrosis in the liver of rabbits inoculated with cultures of hog-cholera bacteria. FIG. 1.-Cephalic aspect of the liver of a rabbit which was found dead on the sixth day after inoculation. The lighter spots are groups of acini destroyed by the growth of bacteria. The larger patch to the left shows groups of acini in which the necrosis has involved only the peripheral zone of the acini. FIG. 2.-Liver of rabbit which died on the eighth day after inoculation. The caudal aspect is shown with two extensive patches of commencing necrosis. In both only the peripheral zone of the acini is involved, giving. the discoloration a mottled appearance. PLATES VII to IX inclusive.-Photo-micrographs of the bacteria producing hogcholera and swine-plague. Made with the Zeiss camera, using the new apochromatic homog. immersion objective, projection ocular No. 4. Magnification 1,000 diameters. The preparations, stained either in Bismarck brown or fuchsin, were mounted in Canada balsam. Illumination from an incandescent electric lamp. PLATE VII, FIG. 1.-Bacterium of hog-cholera. Cover-glass preparation from the liver of a rabbit inoculated with cultures from Illinois. Stained for one hour in an aqueous solution of Bismarck brown. FIG. 2.-Liquid culture of the bacterium of hog-cholera from Illinois. Stained in Bismarck brown. PLATE VIII, FIG. 1.-Bacterium of hog-cholera from Nebraska. From a culture in beef infusion less than twenty-four hours old, inoculated from a colony on a gelatine plate. Stained for one hour in an aqueous solution of Bismarck brown. FIG. 2.-Micrococci of swine-plague. From a culture in beef infusion about twenty hours old. This culture was obtained from a gelatine tube culture of effusion and plastic exudate in the pleural cavity. The lungs were extensively hepatized. Stained for one hour in aniline water fuchsin. PLATE IX, FIG. 1.-Cover-glass preparation from the liver of a rabbit inoculated with a bit of lung tissue obtained from an outbreak of swine-plague in Iowa, January, 1887. Stained in Bismarck brown for one hour, decolorized in per cent. acetic acid for a few moments. Note the polar stain. FIG. 2.-Cover-glass preparation from the blood of a pigeon inoculated from a culture of the microbe of swine-plague from Iowa. Stained in aniline water fuchsin. PLAZE X.-Contagious pleuro-pneumonia. Lung of a diseased steer from Phoenix Distillery, Chicago, Ill. PLATE XI.—Contagious pleuro-pneumonia. Lung of a cow slaughtered in Baltimore, Md. PLATE XII.-Contagious pleuro-pneumonia. Lung of a cow slaughtered in Baltimore, Md. Calf-Raising on the Plains. PLATE I.-Ready for "cutting out." PLATE II.-" Roping" and "cutting out." PLATE III.-Roping a steer to inspect brand. PLATE V.-Branding a steer. |