300 IMPORTANT VARIETIES OF FISSION- FUNGI. 



in such a serum the organism grows out into long threads. 

 Similar results — the serum being active only or especially 

 against the particular culture employed to produce the 

 sickness or immunity — were obtained also by others. 

 Compare S. Wolf (C. B. xxv, 317). 



Related Varieties. — Hauser (I. c.) has designated 

 with the name Proteus mirabilis a form of the Bact. vul- 

 gare characterized by somewhat more feeble liquefaction, 

 and producing especially striking involution forms. An- 

 other he has designated as Proteus Zenkeri, which does 

 not liquefy gelatin and does not any longer cause vigorous 

 putrefaction. These forms were later recognized by 

 Hauser as transformable into each other (C. B. xii, 629). 

 Here also belongs Gerdes' eclampsia bacillus. On the 

 contrary, a Proteus hominis Bordoni-Uffreduzzi (Z. H. iii, 

 338) certainly belongs among those related to the Bact. 

 pneumoniae; it does not exhibit motility, formation of 

 zooglese, nor the production of putrefaction. (Compare 

 p. 228.) The case may be considered as similar to Banti's 

 four "varieties of proteus" (C. B. v, 207). 



Bacterium murisepticum. (Pliigge.) Migula. 



(Plate 33. ) 



Synonyms. — Bacillus murisepticus Fliigge. Bacillus 

 of mouse septicemia Koch. 



Literature. — Koch, E., Wundinfektionskrankheiten, p. 40; Preisz 

 (C. B. XI, 110); Loffler (C. B. xi, 129). 



Microscopic Appearance. — In the culture, beautiful, 

 slender rods, 2-4 /i long, 0.4-6 ij. thick, straight or curved, 

 often arranged in threads (33, viii). In preparations of 

 smeared blood the organisms are only about 1 m long and 

 0.2-0.3/2 thick (33, ix). 



Motility is absent. 



Staining Properties. — Stain well by Gram's method. 



Relation to Oxygen. — Facultative anaerobe. Liborius 

 found it an obligate aerobe. Many cultures grow de- 

 cidedly better when air is excluded. 



Intensity of Growth. — Grows rather slowly. 



Gelatin Plate. — (a) Natural size : After three or four 



