GENERIC CHARACTERS IN THE COCCACEAE 



a consistent positive reaction make up far more than half the total 

 among the parasitic forms from the first two habitats, and less than 

 one-fourth of the forms from water and earth. The air cultures 

 in almost all cases exhibit an intermediate relation, as would be ex- 

 pected, since they must contain forms from both sources. A positive 

 reaction to the Gram stain is evidently closely correlated with life 

 in and on the animal body. 



TABLE 3. 

 CORRELATION BETWEEN HABITAT AND SURFACE GROWTH. 



The abundance of surface growth also varies with the habitat. 

 Very faint and meager growths are fairly abundant in the forms 

 from the surfaces of the body, as would be expected, since our culture 

 media are unfavorable for the more strictly parasitic forms. On 

 the other hand, a majority of the earth and water cocci show abun- 

 dant or very heavy surface growths. The air forms are character- 

 ized by particularly abundant development, as would naturally be 

 expected, since only the vigorous cells probably survive drying and 



dispersal through the air. 



TABLE 4 . 



CORRELATION BETWEEN HABITAT AND THE FERMENTATION OF DEXTROSE BROTH. 



TABLE 5. 

 CORRELATION BETWEEN HABITAT AND THE FERMENTATION OF LACTOSE BROTH. 



