DISTRIBUTION OF 500 COCCi ACCORDING TO PIGMENT PRODUCTION 



VIII 



IX 



+ Parasites 



o Saprophytes 



It has been found •rr.possible to reproduce exactly by lithography the 

 cieiica'e shades of color produced by the cocci. The frontispiece indicates 

 n a g:nera; way the relations of the colors observed. The true colors, 

 ^haracte tstic of the commonest types of Aurococcus, Micrococcus, and Rhodo- 

 coccus, c n easily be identified by an examination of a series of cultures. 



