CLASSIFICATION OF ANAEROBIC BACTERIA 551 



5. The old conception of species in the anaerobic group cor- 

 responds to the general systematists' conception of genera. 

 Generic characters may be based chiefly on qualitative behavior 

 on ordinary media. Pathogenesis and general morphology may 

 be used as auxilliary generic characters. 



6. Specific characters may be based on sugar fermentations, 

 on quantitative chemical action, on the morphology of colonies 

 and to some extent on the morphology of individuals. 



7. We are not as yet ready for extensive biometric determina- 

 tions in studying many of the anaerobic groups and must tempo- 

 rarily adopt a more easily performed technique for the distinction 

 of these organisms. 



8. A classification of the anaerobic group is proposed whose 

 details are to be elaborated in a following paper. 



I wish to extend my hearty thanks to Dr. K. F. Meyer and to 

 Dr. Harvey M. Hall for reading the manuscript of this paper 

 and for making many wise and helpful suggestions which have 

 been followed in its compilation. 



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