OTHER ACID-FAST BACILLI 291 



bacillus). This organism has analogous characters, though presenting 

 minor differences. It also produces pathogenic effects. 



Petri and Rabinowitch independently cultivated an acid-fast bacillus 

 from butter ("butter bacillus"), in which it occurs with comparative 

 frequency. The organism resembles the tubercle bacillus, although it is 

 on the whole shorter and thicker. Its lesions closely resemble tuber- 

 culosis, especially when injection of the organism is made into the 

 peritoneal cavity of guinea-pigs, along with butter, the method usually 

 adopted in searching for tubercle bacilli in butter. This organism 

 produces pretty rapidly a wrinkled growth (Fig. 87, b) not unlike that 

 of Moeller's grass bacillus II. Korn has also obtained other two bacilli 

 from butter which he holds to be distinct from one another and from 



of i(1 . 



Stained with carbol-fuchsiu, and treated with 8 rown at room temperature. 



20 per cent, sulphuric acid. (<*) Moeller's Timothy-grass bacillus I. 



x 1000. ( b ) The Petri-Rabinowitch butter bacillus, 



(c) Bacillus of fish tuberculosis. 



Rabinowitch's bacillus. The points "of distinction are of a minor 

 character. Other more or less similar bacilli have been cultivated by 

 Tobler, Coggi, and others. 1 



Another bacillus of considerable interest is Johne's bacillus or the 

 bacillus of "chronic bovine pseudo-tuberculous enteritis," the lesions 

 produced by it being corrugated thickenings of the mucous membrane, 

 especially of the small intestine. The disease has now been observed in 

 various countries, and has been found to be comparatively common in 

 Britain. The bacilli occur in large numbers in the lesions, and can 

 readily be found in scrapings from the surface. They resemble the 

 tubercle bacillus in appearance, but on the whole are rather shorter ; they 

 are equally acid-fast. The organism has been recently cultivated by 

 Twort and Ingram on egg medium to which there is added |-1 per cent. 



1 For further details on this subject, vide Potet, Etudes sur les bacilles dites 

 addophiles. Paris, 1902. 



