I 9 2 BACTERIOLOGY. 



cases the characters of the colonies, together with 

 the characters of the growths in test-tubes, assist 

 us in distinguishing species which are morpho- 

 logically similar, as in the case of the comma bacilli 

 'of Finkler and of Koch. 



The classification here given will be found to 

 be a convenient form for arranging the micro- 

 organisms for reference, and it may lead the 

 investigator to work upon the same lines as Zopf, 

 and by tracing the life-history of individual forms 

 in pure cultivations, either to extend the work of 

 establishing protean species or to restrict the 



FIG. 72. BACTERIUM OF RABBIT SEPTICAEMIA. 



doctrine of pleomorphism to a very few forms. 

 But though the author adheres to the lines of 

 classification proposed by Zopf, he is not prepared 

 to accept his teachings in their entirety; thus, to 

 embrace all described species, and to be consist- 

 ent with the author's views, it has been necessary, 

 not only to add to Zopf s classification, but in many 

 cases to modify his arrangement of species. For 

 instance, Zopf regards the bacterium of rabbit 

 septicaemia (Fig. 72) as a micrococcus, and the 

 yellow coccus in pus, which may occur in short 

 chains, as a micrococcus. Of some species altera- 

 tion in the nomenclature is justified by necessity. 



