SELECTED PAPERS 



X. Tribe Bacterieae 



i . Kurthia Trevisan, 1 885. 



Rod-shaped bacteria, sometimes united in chains. Either immotile or motile 

 by means of peritrichous flagella. No endospores formed. Chemo-heterotrophic, 

 oxidizing various organic compounds. Gram-positive. 

 The type species is Kurthia zopfii (Kurth) Trevisan. 



2. Alcaligenes Castellani et Chalmers, 1918.* 



Rod-shaped bacteria. Either immotile or motile by means of peritrichous 

 flagella. No endospores formed. Chemo-heterotrophic, oxidizing various or- 

 ganic compounds. Gram-negative. 

 The type species is Alcaligenes faecalis Castellani et Chalmers. 



3. Bacterium Ehrenberg, 1828. Emend. (!).** 



Rod-shaped bacteria. Either immotile or motile by means of peritrichous 

 flagella. No endospores formed. Chemo-heterotrophic, oxidizing various or- 

 ganic compounds, and capable of fermenting carbohydrates with the forma- 

 tion of various organic acids, and usually hydrogen and carbon dioxide. No 

 acetylmethylcarbinol formed. Gram-negative. 

 The type species is Bacterium coli Escherich. 



4. Aerobacter Beijerinck, 1 goo. Emend.*** 



Rod-shaped bacteria. Either immotile or motile by means of peritrichous fla- 

 gella. No endospores formed. Chemo-heterotrophic, oxidizing various organic 

 compounds, and capable of fermenting carbohydrates, 2,3-butylene glycol 

 being one of the main products. Acetylmethylcarbinol is formed. Gram- 

 negative. 

 The type species is Aerobacter aerogenes (Escherich) Beijerinck. 



XI. Tribe Bacilleae 



1. Bacillus Cohn, 1872. 



Rod-shaped bacteria, sometimes occurring in chains. Either immotile or motile 

 by means of peritrichous flagella. Endospores formed. Chemo-heterotrophic, 

 oxidizing various organic compounds. Gram-positive. 

 The type species is Bacillus subtilis (Ehrenberg) Cohn. 



* Including the genus Brucella. 



** It should be well understood that in this genus are included the genera Proteus, 



Salmonella, Eberthella, and Shigella, which nowadays are frequently used. Although 



specialists dealing with this group may feel the need of further subdivision, yet it 



is inacceptable to us to differentiate genera on such trifling characters as are used 



in the current systems. Two organisms which ferment glucose in essentially the 



same way should not. in our opinion, be placed in separate genera, because one of 



them ferments (i.e. hydrolyzes!) also lactose. Nor should this be done because one of 



them splits formic acid into carbon dioxide and hydrogen, whereas the other does 



not (i.e. acid but no gas produced!). 



*** Including the genera Serratia and Klebsiella. 



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