Antagonistic action of i\ (Uiti- 

 hioticiis upon S. lutea 



Antagonistic action of 5. ayit'i- 

 hiot'icus upon B. rn^co'idcs 



Bacteriostatic action of actin( 

 m)'cin upon iS\ luttui 



I^actcnostatic action of acti 

 m\'cin upon R. rnxcoidn 



Figure 5. Antagonistic effects of living organisms and their products. P'rom 

 Waksman and Woodruff (945). 



