THE NOMENCLATURE OF BACTERIA. 121 



literally more correct to call the genera which we call 

 " mycobacterium " " tuberculomyces," such a propo- 

 sition is absolutely unallowable. Renaming is only re- 

 quired if the name given was employed earlier with another 

 signification. Thus, Cohn founded upon a certain organ- 

 ism the new genus strep tothrix, without knowing that 

 Corda, about thirty years previously, had conferred this 

 name upon a fungus that is totally different from his. 

 His new variety must, therefore, receive a new genus name, 

 which he who first observed Cohn's oversight is justified 

 in establishing. 



7. It happens that an author differs from his predeces- 

 sor regarding the bounds of the genera, that therefore he 

 transfers a species from one genus into another, pre-exist- 

 ing or newly formed by himself. This is permissible; still, 

 the designation of the species must not be changed. So we had 

 the right, when we broke up the very large genus bacillus, 

 following the suggestion of Hu'ppe, into the two genera, 

 bacillus and bacterium, to rename a number of varieties 

 (for example, Bacillus pyocyaneus being renamed Bac- 

 terium pyocyaneum), but we did not have a right (how- 

 ever much the name pyocyaneum was disliked) to rename 

 the organism Bacterium coeruleo-viride or Bacterium Ges- 

 sardi or anything else. 



8. The author who names a genus places his name after 

 it. We speak of the Bacillus Cohn, and mean the genus 

 bacillus as Cohn established it ; of the Vibrio Ehrenberg 

 emend. Loifler, and mean the genus vibrio as established 

 by Ehrenberg and afterward more accuratelv described by 

 Loffler. 



9. Whoever discovers a new species or names one not 

 previously named lege artis, gives it a genus and a species 

 name, and places his name after the latter. Flu'gge, who 

 first named a large number of bacteria, gave, for example, 

 the name Bacillus pyocyaneus Fliigge to the long-known 

 cause of bluish-green suppuration. 



10. When one places a species in a new genus he puts 

 his own name after the new name, thus, Bacterium pyocy- 

 aneum Lehmann and Neumann, but it is always to be rec- 

 ommended to add, in parentheses, the name of the author 

 who first named the species. Therefore we always write, 



