132 MICRO-ORGANISMS AND DISEASE. [CHAP. 



micrococcus, which, when artificially cultivated yields 

 material which, inoculated into pigs, is said to produce the 

 disease. Mice, rabbits, and pigeons are susceptible to the 

 disease, but in rabbits after several transferences the virus 

 becomes attenuated, and with this a mild form of the 

 disease can then be produced, protecting the animal thus 

 operated upon from a subsequent severe attack. 



From the recent investigations on this subject by Schiitz l 

 it is quite clear, that the disease that in France is called 

 rouget and in Germany erysipelas of swine, is an altogether 



FIG. 64. FROM A PREPARATION OF BRONCHIAL Mucus OF A PIG DEAD OF 

 SWINE PLAGUE. 



1. Detached epithelial cells of alveoli. 



2. Bacilli. 



3. Micrococci. 



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



different disease from what in this country and America is 

 called swine-fever, or swine-plague, or pig-typhoid. The 

 symptoms and course of the disease are totally different in the 

 two maladies. Schiitz has shown that the disease rouget or 

 erysipelas is due to a minute bacillus which in size, mode of 

 cultivation, and effect on inoculation, is almost identical 

 with the bacillus of mouse-septicaemia (Koch). Schiitz ex- 

 amined some of the attenuated lymph sent by M. Pasteur, 



1 Mitth. aus d. k. Gesundheitsamte, Berlin, i. 1885. 



