218 Manual of Veterinary 31icrohiology . 



pneumonia (bou-frida) peculiar to this species ; in soli- 

 peds it gives rise to symptoms recalling the typhoid 

 disease ; finally, it would explain epizootic abortion 

 when it is spontaneously transmitted to cows. 



Transmission is readily procured by hypodermic, in- 

 travenous and iutra-pulmonary injection, less easily by 

 the digestive canal. The virus loses its virulence by 

 multiple transfers on artificial media and passages 

 through individuals in which the disease develops 

 slowly. On the contrary, its virulence increases in 

 organisms very susceptible to its influence. Thus, ac- 

 cording to M. Galtier, the pneumo-enteritis of the pigs 

 at Gentilly is transmissible to sheep (contrary to the 

 assertion of M. Nocard) when the substance inocu- 

 lated is taken not from a culture but from a diseased 

 animal. 



The natural contagion occurs by ingestion, and es- 

 pecially by inhalation, of virulent products. The dis- 

 ease is also transmitted from the mother to the foetus. 



According to the researches of M. Galtier, which 

 we have just briefly reviewed, pneumo-enteritis, which 

 is generally considered to be peculiar to the pig, ex- 

 tends to all farm animals, especially to the sheep, 

 bovines and solipeds. The disease being transmitted 

 to the foetus, calves coming from diseased cows which 

 are or have been subject to coughing are born with 

 the germ of the disease in them and die in a few days 

 with the lesions of broncho-pneumonia and enteritis 

 (pneumo-enteritis of calves). 



Infectious pneumonia of the ing, swine plague. 



This disease of swine has been described in Ger- 

 many under the name Schweineseuche, and in Amer- 



