Fig. I. 



PLATE VI 



Fig. 



Pholc 



I'.rislc!. 



CULTURES OF JOHNE'S BACILLUS. 



Ym I —Streak culture on an ea:g medium made up with saline and 

 containing 4 per cent, glycerine and i per cent, of the chloroform 

 insoluble portion of the cooled alcoholic extract of B. pliki. 



Fig. 2.— Isolated colonies on a glycerine-agar medium containing dog's 

 filtered ascitic fluid and the same extract of B. plila as Fig. i. 



Fig. 3.— Streak culture on same medium as Fig. 2. 



[To face page 82. 



