TABLE 2 



RESULTS OF TESTS OF SEA-WATER SAMPLES WITH THE MUTANTS 



1) Growth controls where specific supplement was added were all ++++ 

 Reversion controls were all negative. 



2) Glycerol (0.2°/ o ) added to all samples as carbon source. 



growth . 



3) 1 l 1 1 = non limiting concentration (optimal growth) 



++,+> +, = limiting concentrations; moderate, slight, very slight, 

 and no growth respectively. 



57 



