GENERAL SYSTEMATIC BACTERIOLOGY 215 



are definitely included. Four other species Bad. Enchelys, Bad. 

 pundum, Bad. tremulans and Bad. termo are questioned, 



SLx years later in his classic work on the Infusoria Ehrenberg (1836, . 

 p. 75) characterized the genus Baderium as follows: "Animal e familia 

 Vibrioniorum, divisione spontanea in catenam filiformen rigidulam 

 abiens." 



One species only, Baderium triloculare is included. In his drawing of 

 Baderium triloculare a polar flagellum is shown. 



A careful perusal of the description certainly reveals nothing that 

 would enable one even with a moderate degree of certainty to identify 

 Ehrenberg's species. Certainly most of them were based on impure or 

 mixed cultures. From different localities and conditions the same organ- 

 ism was frequently described though differing sufficiently in size and 

 appearance to justify the conclusion that the forms were quite distinct. 



Inasmuch as some effort has been made to tie up the genus Baderium 

 to Baderium termo as a type species, the following points are worth}^ of 

 note. 



1 . Bacterium termo (Mueller) Ehrenberg was not included as a mem- 

 ber of the Genus Baderium in the paper in which the genus was first 

 proposed, in fact, as Monas termo Mueller, it was placed in another 

 genus. 



2. Mueller (1786, p. 1) states that Monas termo is spherical and Ehr- 

 enberg (1828) likewise describes it as globular ("exacte globosa")- 



3. The organism was found in water and in infusions of animal and 

 vegetable matter. 



It should be noted that Ehrenberg includes the genus Bacterium as 

 one of five genera in his family Vibrionia, the other genera being Vibrio, 

 Spirochaeta, Spirillum and Spirodiscus. Bacterium is differentiated 

 from Vibrio in that it is non-flexuous, while the latter is flexuous. 



Dujardin (1841, p. 212) practically adopted Ehrenberg's classifica- 

 tion. He designated as Bacterium all those forms which are straight, 

 more or less definitely jointed, non-flexile, and which were capable of 

 only a slow wave-like motion. Vibrio, on the other hand, contained 

 those organisms which are straight or bent, more or less definitely 

 jointed, and which show sinuous motion like a snake. He placed three 

 species in this genus. Bad. termo, Bad. catenula, and Bad. pundum. 

 His description reads: "Corps fihforme, roide, devenant plus ou moins 

 distinctement articule par suite d'une division spontanee imparfaite. 

 Mouvement vacillant non ondulatoire." Here again there is nothing 

 which will enable the bacteriologist to identify any one of the species. 



