272 Associative and Antagonistic Effects 



6. Destruction of certain organisms by others, as that of bacteria 

 by protozoa, or the parasitizing of some organisms upon others, as 

 of certain nematodes upon Japanese beetle larvae. 



7 Production by certain microorganisms and liberation of specific 

 substances that have a selective bacteriostatic and bactericidal effect, 

 or fungistatic and fungicidal action, or both, namely, antibiotics. 



