Antagonistic action of .S. ant'i- 

 b'toticus upon S. lutea 



Antagonistic action of S. ant'i- 

 btoticus upon B. myco'ides 



Bacteriostatic action of actino- 

 mycin upon 5. lutea 



Bacteriostatic action of actino- 

 mycin upon B. myco'tdes 



Figure 4. Antagonistic effects of living organisms and their products. From 

 Waksman and Woodruff (974). 



