18 MANUAL OF DETERMINATIVE BACTERIOLOGY 



The generic term Bacterium is retained in this outUne to cover those 

 groups of the true bacteria that are Gram-negative, non-spore-forming, 

 motile and non-motile rods. Lehmann and Neumann recognize 20 sub- 

 groups in this genus, many of which correspond with the genera recognized 

 in the Manual. In an effort to develop a rational nomenclature the term 

 Acetobacterium (occurs first in review by Ludwig, Cent. f. Bakt., II Abt., 

 4, 1898, 870) is used in place of Acetohacter, Plocamohacterium (Loewi, Wien. 

 klin. Wchnschr., 33, 1920, 730) in place of Lactohacillus, and Fusobacterium 

 (Knorr, Cent. f. Bakt., I Abt., Orig., 89, 1922, 4) in place of Fusiformis 

 without regard to priority. Encapsulatus Castellani and Chalmers (Man- 

 ual Tropical Med., 3rd ed., 1919, 934) is used in place of Klebsiella Trevisan 

 (Atti Accad. Fis.-Med.-Stat. Milano, Ser. 4, 3, 1885, 107). 



Janke (Cent. f. Bakt., II Abt., 66, 1926, 481) reprints the classification 

 developed in the first edition of the present Manual and compares it with 

 that proposed by Orla- Jensen and Enderlein. 



