SUBFAMILIES AND GENERA OF COCCACE^E 83 



A comparison of the general vigor of growth shows that 

 each color has here again its own relation. Among the 

 white forms, two maxima appear, one under "very faint" 

 growth and one under "abundant" growth. This is 

 because this group is a compound one, including first, 

 forms which give a really white growth, abundant in 

 amount, and second, the feebly growing streptococci 

 which are classed here, altho they really produce no 

 pigment at all. The yellow and orange chromogens 

 show maxima under the "good" growth; and almost all 

 the "very heavy" growths belong to the yellows. The 

 red forms are almost all of one type, — the "abundant." 



CORRELATION BETWEEN CHROMOGENESIS AND DEXTROSE 



FERMENTATION. 



Number of cultures in each class. 



Acid Produced (per cent 

 Normal). 



o .0 and alkalin 



o .1-0 .2 



0.3^.6 



o .7-2 .0 



Over 2 .0 



Red. 



CORRELATION BETWEEN CHROMOGENESIS AND LACTOSE 



FERMENTATION. 



Number of cultures in each class. 



Acid Produced (per cent 

 Normal). 



— o .2 and under. 



— o .1-0.0 



.1-0 .4 



0.5-1 -4 



1 .5 and over . . . 



Red. 



5 

 16 



3 



1 

 o 



