pigs, without obtaining any signs of tu- 

 berculous lesion. 



He repeated the experiment with dust 

 from the sputa dried in daylitigt, in the 

 interior of the laboratory with negative 

 results, in spite of a long series of trials. 

 Finally this tenacious investigator gave 

 the subjects 10 centigrams of dustdisse- 

 cated in the open air and light, and 

 after a certain lapse of time the post 

 mortem revealed in one alone, hardly 

 perceptible granulations in the lungs and 

 liver; the other organs were perfectly 

 healthy. 



We must admit, then, that virulent 

 germs disseminated, are only reabsor- 

 bed in small quantities and on very rare 

 occasions, moreover, the virus is in a bad 

 state of preservation, and furthermore, 

 the indirect means of contagion are ex- 

 ceptional, seeing that the necessary con- 

 dition for infection consists in the repe- 

 tition of the virulent contacts. 



Among others, Freidberger and Fron 



