116 EEPOET OF THE BUEEATJ OF ANIMAL INDUSTRY. 



DESCEIPTION OF PLATES. 



PLATE I xf . Swine plague. Eight lung of pig No. 407 (see text), showing the lat- 

 eral aspect. The diseased portion is sharply dernarkated from the nor- 

 mal portion and concealed in part by a pleural exudate of a spongy 

 texture. 



PLATE II Xf. The same lung, as seen from the ventral aspect. The localization of 

 the disease is well brought out. On the right a portion of the diaphragm 

 is firmly adherent. 



PLATE III, FIG. 1. Section through lung of pig 407, as indicated by the arrow 011 

 Plate I. The thickened pleura, with portion of the lung tissue converted 

 into caseous masses on the left, caseation beginning above. 

 FIG. 2. Portion of lung tissue from pig No. 408, showing the grayish-yellow 

 mottling of the surface; frequently observed in this disease, due to the 

 cellular exudate in the ultimate bronchi and alveoli (broncho-pneumo- 

 nia). 



PLATE IV, FIG. 1. Section through the lung of pig No. 396, showing cheesy masses 

 embedded in the lung tissue; frequently observed in advanced stages of 

 the disease. 



FIG. 2. Portion of the large intestine of the same animal covered with circum- 

 scribed masses of exudate ; frequently observed in swine plague. 



PLATE V, FIG. 1. Collapse of various groups of lobules in the principal lobe of a 

 pig's lung. Frequently found in young pigs which have died of hog 

 cholera, in those affected with lung worms, and in a small percentage 

 of those slaughtered during health. 



FIG. 2. Broncho-pneumonia affecting animals under various conditions and not 

 infrequently found in animals which have succumbed to hog cholera. 

 The air cells and smallest air tubes are shown distended with a yellow- 

 ish material, which is of a dry, caseous consistency and may be teased 

 out in the form of minute branching cylinders. 



PLATES VI, VII, VIII. Photomicrographs of hog cholera bacilli in different culture 

 media. All were made at a uniform magnification of 1000 diameters, 

 with the Zeiss apochromatic objective of 3 mm and 1.30 numerical aper- 

 ature, using projection ocular No. 4 and Abbe condenser with largest 

 diaphragm. Orthochromatic plates and picric acid screen. 



PLATE VI, FIG. 1. Coverglass preparation from spleen of rabbit innoculated with 

 hog cholera bacilli. Stained two to three minutes in aqueous solution 

 of fuchsin. Mounted in xylol balsam. X 1000. 



FIG. 2. Coverglass preparation from bouillon-peptone culture five days' old. 

 Stained in aniline- water-fuchsin for five minutes, and decolorized in one 

 per cent, acetic acid for a few seconds. Mounted in xylol balsam. 

 X 1000. 



PLATE VII. FIG. 1. Coverglass preparation from bouillon-peptone culture one day 

 old. Stained same as Fig. 1 of Plate VI. Mounted in xylol balsam. 

 X 1000. 



FIG. 2. Coverglass preparation from gelatine culture two days old. Stained 

 same as Fig. 2, Plate VI. X 1000. 



PLATE VIII, FIG. 1. Coverglass preparation from colony of hog cholera bacilli taken 

 from an Esmarch tube, made directly from spleen of pig, fifteen days 

 old. Stained same as Fig. 1, Plate VII. X 1000. 



Fio. 2. Coverglass preparation of hog cholera bacilli from agar culture fifteen 

 days old. Stained same as Fig. 1, Plate VI. X 1000. 



