CHAPTEE XIV. 



THE CHARACTERS OF SOME COMMONLY OCCURRING 

 ORGANISMS NOT DESCRIBED IN THE PREVIOUS 

 PAGES. 



Micrococcus aerogenes — M. agiUs — Bacillus aquaiiUs — B. wrboresoens 

 — Black torula — B. erytJirosporus — Spirillum FinJcler-Prior — B. 

 fluorescens Uquefaciens — B. fluorescens non-liquefaciens — B. gaso- 

 formans — B. jacinthus — ^Magenta bacillus — B. megatherium — 

 Spirillum, Metschnihovi — B. mesentericus fuscus — B. mesentericus 

 vulgatus — Bacillus of mouse septicaemia — Peat bacteria — Phos- 

 phorescent bacteria— Pink torula — B. prodigiosus — Proteus vulgaris 

 — Proteus mirabilis — B. ramosus — Spirillum, ruhrum — Sarcina 

 alba — Sa/roina luiea — B. subtiKs — M. tetragenus — B. tholoeideum, 

 — Spirillum, tyrogenv/m — B. violaceus — M. violaceus. 



Micrococcus Aerogenes. — Forms large oval non-motile cocci. 

 It is very resistant to the action of acids, and in nutrient 

 media containing sugar it produces a large amount of gas. 

 This organism occurs in the intestine and in polluted water. 

 Cultural characters : 



Gelatine Plates. — Forms circular gray-white colonies. 



Gelatine Tubes. — Forms a flat, gray-white, button-like 

 growth on the surface; in the depth a brownish-yellow 

 growth appears. After some time slight liquefaction of 

 the gelatine takes place. 



Agar-Agar. — A yellowish-white expansion forms. 



Potatoes. — A slimy gray- white growth forms. 



Micrococcus Agilis. — This organism is a motile coccus, 

 which is found in water. The cocci, which are 1 /a in 



