PL ATI- 27. 



I - 



y 



Acid-fast bacillus from buttpr (Petri-Rabiuowitscli). Agar 

 culture; 2 days' growth at 37' C. Stained Ziehl-Xeelseii. 

 X 1000. 



\ 



/ 



f 



V 



B. ladis niger (Gorini). Agar culture; 2 days' growth at 

 sr C. stained carbol-fuchsin dil. x ICOO. 



[Face page 400 



