6 



THE AMERICAN MONTHLY 



[Jan 



gelatin plate deep colony, 6 days, fig, 18, is magnified 100 

 dia.; gelatin plate surface colony, 5 days, figure 19 is 

 magnified 60 diameters. Cover-glass preparations are 

 shown in figures 20, 21, 22, — milk culture, xl50Q, in fig. 

 20 ; glucose bouillon culture, xl500, in fig. 21; and agar 

 culture, X1500 in fig. 22. 



The cultural characters are in nearly every way simi- 



lar to those of B. lacterii, but in agar tube the growth is 

 feebler, in gelatin plate the riuged appearance is fainter 

 and the quantity of clear fluid separated from the curd is 

 larger especially at temperature of 37 degrees C. 



Those interested in fuller details of this milk problem 

 should send to the Arkansas Agricultural Experiment 

 Station for Bull. No. 45 which is distributed gratuitously. 



