THE CLASSIFICATION OF BACTERIA 127 



Beer or wort. A moist, slimy, smooth-veined membrane ; fluid only slightly 



turbid. Minimum temperature, 4-5 C. ; optimum temperature, 34 C. 

 Habitat. Beer and beer-wort. 



14. Bact. oxydans Henneberg 



Centralblatt f. Bakteriol., 2d Abt., Ill, 1897, 223. 



Morphology. Bacilli, 0.8-1.2: 2.4: 2.7 p; in chains rather loosely jointed; 

 show rotatory motion (Henneberg, I.e.). Involution forms as filaments 

 with bud-like swellings ; fluid turbid below the membrane. Optimum 

 temperature, i8-2i C. Minimum temperature, 8 C. ; maximum, 

 3o-33 C. 



Habitat. Beer, etc. 



15. Bact. acetosum Henneberg 



L.c, IV, 1898, 14. 



Morphology. Bacilli, 0.4-0.8 : 1.0 /*, in chains of elements. Optimum temper- 

 ature, 28 C. ; minimum, 8 C. ; maximum, 36 C. Involution forms 

 like B. Pasteurianum. 



16. Bact. xylinum Brown 



Jour. Chem. Soc, London, XLIX, 1886, 432. 

 Characters as specified in the Synopsis. 



17. Bact. acetigenum Henneberg 



L.c, IV, 1898, 15. 



Morphology . Bacilli, 0.8-1.2 : 1 .2-1 .4 ft ; no chain formation of the elements ; 

 enlarged ellipsoidal coccoid involution forms. On beer and yeast- 

 water a thin, very tough membrane, which sinks in fragments to the 

 bottom, a new membrane forming ; fluid often turbid. With H 2 S0 4 and 

 iodine, often a cellulose reaction of the membrane. According to Henne- 

 berg, bacilli show a rotatory motion. Optimum temperature 38 C. 



18. Bact. aceticum (Kruse) 



Bacterium C of sour dough Peters: Bot. Zeitung, 1889. 



Bacillus aceticus-Petersii Kruse : Fliigge, Die Mikroorganismen, 1896, 355. 



Morphology. Bacilli 0.8-1 .6 /x, rounded pointed, singly and in twos, rarely 



in chains of four. In old cultures, short, swollen involution forms. 

 Gelatin colonies. Round, convex, becoming flatter and more spreading. 



