234 Manual of Veterinary 3Hcrohlolo<jy. 



membrane of the throat with a spatula. Cagny pro- 

 poses, in order to increase the bronchial secretion, the 

 injection under the skin of ten to twenty centigrams 

 of veratrine. 



Poels has resorted, in the absence of discharsre, to 

 tracheotomy and the examination of the tracheal 

 macus. 



The rarity of tubercular lesions of Demour and 

 Decemet's membrane tends to refute the assertion 

 of M. Mandereau as to the constant presence of the 

 bacillus in the aqueous humor of tuberculous animals, 

 and this assertion, which promised an easy diagnosis 

 of the disease, has quickly been contradicted by Le- 

 clainche and GrefRer, whose investigations on twenty 

 animals which were certainly affected always gave 

 negative results. 



M. Peuch, having placed an irritating seton in a 

 tuberculous cow, found, by inoculating the pus of the 

 seton to guinea pigs, that the bacilli passed into the 

 pus from the eighth to the fourteenth day. He there- 

 fore recommends the application of such an exudatory, 

 and subsequent inoculation in order to remove the 

 uncertainty of the diagnosis. 



If the presence of the bacillus in the expectoration 

 enables us to affirm the existence of the disease, its 

 absence does not authorize us in positively affirming 

 that it does not exist. Sometimes it is necessary to 

 resort to inoculation of expectorated products, and 

 the same precaution should be observed when dealing 

 with milk, etc. Under such circumstances we have 

 recourse preferably to the guinea pig, and only in de- 

 fault of this animal, to the rabbit. 



When we possess pure products — cultures or young 



