THE GENUS SARCINA 



237 



Gruber; S. Welckeri, Rossmann, are non-liquefying forms. 

 It is possible that a white type center of sarcinae should 

 be recognized, corresponding to M. candicans, in the other 

 genus. The evidence from the literature is less conclusive, 

 however, in this case. Among our own cultures no type cen- 

 ter of paler hue was evident, as shown in the table below. 



DISTRIBUTION OF "HUES AMONG THE SARCINAE. 

 Number of Strains of Each Hue. 



Hues* 



S. flava. 

 S. citrea. 

 S. lutea. 



* See Frontispiece. 



On the whole it seems best for the present to consider the 

 light-colored sarcinae as merely variants from the typical 

 forms, — of insufficient importance to warrant the creation 

 of a special type center. 



Reference must also be made to several sarcinae charac- 

 terized by definite and peculiar properties, but apparently 

 of rare and exceptional occurrence. Gruber (1902), for 

 example, describes an interesting organism, apparently 

 belonging to the genus Sarcina, producing a thick, slimy 

 growth in sugar solutions. This property appears to be 

 latent all through the family of the Coccaceae, appearing as 

 we have seen in the genus Streptococcus and culminating 

 in the genus Ascococcus. The name given by Gruber 

 {Coccus lactis viscosi) violates every principle of nomen- 



