THE TUBERCLE BACILLUS 617 



of many workers is, so far, so inconclusive that the time has not come for 

 commercial exploitation and the cruel deceptions of false hopes. The 

 subject, however, deserves carefully controlled further investigations. 



Bacillus of Timothy. Moeller isolated from timothy-grass and from 

 the dust in haylofts acid-fast bacilli, like Bacillus tuberculosis. They 

 grow rapidly on agar, soon showing a deep red or dark yellow color. 



Bacillus butyricus (Butter Bacillus). Slightly acid-fast bacilli 

 resembling Bacillus tuberculosis have been isolated from milk and butter 

 by Petri, 89 Rabinovitsch, 90 Korn, 91 and others. 



These bacilli are easily differentiated from Bacillus tuberculosis 

 culturally. They are slightly pathogenic for guinea-pigs, but not for 

 man. 



Bacillus smegmatis and the bacillus of leprosy will be discussed in 

 separate sections. The differentiation of these organisms by staining 

 reactions has been discussed in the section on staining methods. 



s 9 Petri, Arb. a. d. kais. Gesundheitsamt, 1897. 

 MRabinovitsch, Zeit. f. Hyg., 1897. 

 91 Korn, Cent. f. Bakt., 1899. 



