SUBFAMILIES AND GENERA OF COCCACE^E 103 



white ones. Eighty per cent of the orange forms acidified 

 mannite, against 50 per cent of the whites. In glycerin, 

 70 per cent of the orange strains and 55 per cent of the 

 white ones were positive. Raffinose was attacked by two- 

 thirds of the orange forms and by only 40 per cent of the 

 white ones. In the absence of quantitative data it is 

 difficult to know how much this means, but it indicates a 

 distinct difference between the groups. 



It is clear that as actually found, in the body or on 

 its surface, some cocci produce white and some, orange 

 growths. Dudgeon acknowledges the force of this fact 

 (altho he is misled as to the importance of chromogenesis 

 by the irrelevant circumstance that colonies of orange 

 cocci in a crowded plate may remain white). He points 

 out too that the white cocci are uniformly associated 

 with less serious pathological lesions than the orange 

 forms. These two facts are universally obvious to all 

 students of suppurative processes. When, in addition, it 

 appears that even a small series of the white forms show 

 distinct group differences from the aurococci in relation 

 to dextrose and lactose and gelatin, the recognition of a 

 generic group seems warranted. 



We have defined the genus Albococcus by its more 

 salient and obvious characters alone. Dudgeon's paper 

 suggests that the reducing power of these organisms, and 

 their action upon mannite, glycerin, and raffinose, may 

 also prove significant; but quantitative studies must be 

 carried out before this is established. 



