XL] 



BACILLUS : PATHOGENIC FORMS. 



97 



The smallest droplet of any of these cultivations produces 

 the disease in pigs, mice, and rabbits. The mice and rabbits 



FIG. G2. FROM A SECTION THROUGH A NF.CROTIC PATCH OF THE LIVER OF A 

 MOUSE DEAD OF SWINE PLAGUE. 



1. Tracts of liver cells shrunk. 



2. Capillary blood-vessels filled with very small micrococci, 



amongst which are seen the bacilli. 



3. Bacilli only. 



Magnifying power 700. (Stained with Spiller's purple and magenta.) 



die with exactly the same appearances and with the same 

 anatomical lesions as when they are inoculated with material 

 directly taken from the diseased organs of a pig dead of swine 



FIG 63. BACILLI OF SWINE PLAGUK, 

 FROM AS ARTIFICIAL CULTURI , 

 AFTER FORTY-EIGHT HOURS' IN- 

 CUBATION. 



Magnifying power 700. (Dried and 

 stained with Spiller's purple.) 



Fio. 64 BACILLI OF SWINE PLAGUF, 

 FROM AN ARTIFICIAL CULTURE, 

 DURING SIXTH DAY OF INCUBATION. 



1 and 2. Bacilli. 



3. Bacilli in which spores have been 



formed. Magnifying power 7oO. 



(Fresh specimen.) 



plague. Those animals generally die on the fifth, sixth, or 

 seventh day, and on post-mortem examination show a charac- 

 teristic swelling of the spleen, a characteristic disease of the 



H 



