Generic Characters in the Coccaceae 



179 



forming organisms produce only very faint, meager, or good growths 

 while a large majority of the sarcinae form abundant or very heavy 



TABLE II. 

 Correlation between Cell-Grouping and Surface Growth. 



growths. The fact that the packet-forms flourish on artificial media 

 should naturally result from their saprophytic origin. 



TABLE 12. 

 Correlation between Cell-Grouping and the Fermentation of Dextrose Broth. 



TABLE 13. 

 Correlation between Cell-Groupino and the Fermentation of Lactose Broth. 



A marked correlation between the packet-forming organisms 

 (presumably saprophytic) and the fermentation of sugars is mani- 

 fested in Tables 12 and 13. Taking Table 12 as an illustration, 

 there will be found to be about 60 per cent of the packet-formers 

 producing alkali, or, at most, fermenting dextrose but slightly (to 

 0.2) — almost none of the organisms occurring in the class of highest 

 acid producers. Conversely, 70 per cent of the organisms which 

 do not form packets produce acid from 0.3 up to the highest amount. 



The power to reduce nitrates appears with about equal regular- 

 ity in both our morphological groups. 



