GENERAL SYSTEMATIC BACTERIOLOGY 17 



Persoon (1822, p. 96) used the designation Mycoderma mesentericum 

 for the membrane which appears upon the surface of fermenting alco- 

 holic solutions, consisting largely of acetic acid bacteria and yeasts. 

 The organism was classed with the fungi; its relationship to the In- 

 fusoria of Mueller was not at the time apprehended. 



Bory de St. Vincent (1824) created the genus Melanella to include 

 all non-flexible organisms of the group of Vibrionides whether straight 

 or spiral. To this genus he transferred four of Mueller's species of 

 Vibrio. {V. lineola, V. rugula, V. bacillus and V. spirillum). 



Bory de St. Vincent (1826) prepared a "Tableau des Ordes, des 

 Families et des Genres de Microscopiques. " This was a dichotomous 

 key to genera. A translation of the key carried out to include only the 

 forms now listed with the bacteria is as follows : 



Bory de St. Vincent's Classification (1826) 



a. Without Testa. 



b. Perfectly smooth, without cilia or other vibratile organs 

 Order Gymnode 

 c. Without appendages. 



d. Never linear or wormlike. (5 families.) 

 dd. Linear or wormlike 



Family Vibrionides 

 e. Body opaque. 



f. Coiled in a discoid spiral. 



STpirilina 

 ff. Not coiled in a discoid spiral. 

 Melanella 

 ee. Body transparent (diaphanous), 

 f. Attenuate at both tips. 



Vibrio 

 ff. Obtuse. 



g. With one end enlarged. 



Lacrimatoria 

 gg. Not enlarged at one end. 

 Pwpella 



Von Baer (1827, p. 748) proposed to establish a genus Lineola to 

 include all of the extremely minute Infusoria. 



The first considerable contributions to our knowledge of bacteria 

 and their classifications, following Mueller, were those of Ehrenberg 

 (from 1828-1838) . Certain of his genera of the Infusoria were made up 

 almost entirely of organisms now included with bacteria. The follow- 

 ing key will indicate the principal groups of the Infusoria and the posi- 

 tion of the " bacterial " genera in the system. 



