438 



Marine Microbiology 



SALT WATER 

 MEDIUM 



FRESH WATER 

 MEDIUM 



Opink ® blue © red O 



phenol 



butanol 



yellow 



Canet 41 

 (s.w. type) 



El Agheilo Z 

 (s.w. type) 



Hildenborough 

 (f.w. type) 



Essex 6 

 (f.w. type) 



Fig. 5. Sketches of chromato grams of extracts of Desulfovihrio desulfuri- 

 cans. ( For description see text. ) 



