108 Report of the Department of Bacteriology of the 



A Numerical System of Recording the Salient Characters op an Organism. 



(Group Number.) 



100. Endospores produced. 



200. Endospores not produced. 



10. Aerobic (Strict). 



20. Facultative anaerobic. 



30. Anaerobic (Strict). 



1 . Gelatin liquefied. 



2. Gelatin not liquefied. 



. 1 Acid and gas from dextrose. 



0.2 Acid without gas from dextrose. 



. 3 No acid from dextrose. 



. 4 No growth with dextrose. 



.01 Acid and gas from lactose. 



.02 Acid without gas from lactose. 



.03 No acid from lactose. 



.04 No growth with lactose. 



.001 Acid and gas from saccharose. 



.002 Acid without gas from saccharose. 



.003 No acid from saccharose. 



.004 No growth with saccharose. 



.0001 Nitrates reduced with evolution of gas. 



. 0002 Nitrates not reduced. 



. 0003 Nitrates reduced without gas formation. 



.00001 Fluorescent. 



.00002 Violet chromogens. 



.00003 Blue 



.00004 Green 



.00005 Yellow 



.00006 Orange 



.00007 Red 



.00008 Brown 



.00009 Pink 



. 00000 Non-chromogenic. 



.000001 Diastasic action on potato starch, strong. 



.000002 Diastasic action on potato starch, feeble. 



.000003 Diastasic action on potato starch, absent. 



.0000001 Acid and gas from glycerine. 



. 0000002 Acid without gas from glycerine. 



.0000003 No acid from glycerine. 



.0000004 No growth with glycerine. 



In order to make the results of the present study as intelli- 

 gible as possible to all workers the probable synonyms in the classi- 

 fication of Conn, Esten and Stocking have been added. 



The precautions which were observed in making certain that 

 the forms studied were actually derived from the udder have been 

 explained under the head of technique. In classifying these or- 

 ganisms all determinations were made in triplicate and when for 

 any reason the reaction was in doubt triplicate cultures were again 

 prepared on a later date. 



