DESCRIPTION OF SPECIES. 



511 



to consist of the regularly-arranged 

 parallel rods. The chains of rods 

 become twisted at intervals into 

 curious convolutions, from which 

 offshoots are continued in various 

 directions. These long shoots or 

 processes are again twisted at 

 intervals into varying shapes and 

 patterns (Figs. 202, 203). Culti- 

 vated in nutrient gelatine, the bacilli 

 form on the surface visible windings, 

 from which fine filaments grow 

 down iato the gelatine. They 

 spread out also in almost parallel 

 lines transversely from the needle 

 track. The gelatine is not liquefied. 

 On an oblique surface of nutrient 

 agar-agar the filaments spread down- 

 wards into the substance of the 

 jelly, and outwards from the cen- 

 tral streak on the surface, forming 

 a feather-like cultivation (Fig. 201). 

 They were obtained from the 

 air, and later were identified by 

 the author with Bacterium Zopfii. 

 Bacillus figurans (Vaughan).— 

 Rods and threads. 



Colonies composed of curved and 

 terlacing lines. 



In gelatine they grow in the track 

 of the needle, and very slowly 

 liquefy it. 



On agar they form a thin white 

 layer. i 



They were found in water. 

 Bacillus filiformis (TUs).— Rods 

 4 /x in length and 1 /n in width, 

 singly and in chains. Spore-forma- 

 tion present. 



Colonies are granular, with yel- 

 lowish nucleus. 



Inoculated in the depth of gela- 

 tine there is no growth in the 

 track of the needle, but a whitish 

 growth on the surface, liquefying 

 the jelly slowly. 



In broth they form a skin on 

 the surface. 

 On agar the growth is white. 

 On potato the growth is dry and 

 after a time brownish. They 

 coagulate milk, s 

 They occur in water. 

 Bacillus flliformisHavaniensis 

 (Sternberg). — Long slender rods, 

 3 /i in diam., and filaments. 

 Colonies circular, irregular ; deep 



colonies are brownish ; superficial 

 colonies thin and translucent. 



Inoculated in the depth of gela- 

 tine the growth is scanty in the 

 track of the needle. 



In the depth of agar an opaque 

 branching growth occurs in the 

 track of the needle, and a scanty 

 milk-white growth on the surface. 



In broth they cause opalescence. 



They were isolated from the 

 liver in fatal cases of yellow fever. 



Bacillus flavescens (Pohl). — 

 Rods 21 to 2-2 /i in length, -8 /x 

 in width. Slightly motile. 



Colonies yellow and granular. 



Inoculated in the depth of gela- 

 tine the bacilli produce a filament 

 in the track of the needle, and a 

 growth spreads over the free sur- 

 face. 



On the surface of agar the growth 

 is composed of isolated yellow 

 colonies. 



On potato they grow rapidly,, 

 forming a shiny yellow layer. 



They occur in marsh water. 



Bacillus flavocoriaceus (Ada- 

 metz). — Minute rods occurring in 

 zoogloea. 



Colonies circular, sulphur-yellow. 

 Under a low power they show a 

 brownish-yellow nucleus and yellow 

 periphery. 



Inoculated in the depth of gela- 

 tine the growth is granular in the 

 track of the needle and on the free 

 surface. 



They occur in water. 



Bacillus fluorescens aureus 

 (Zimmermann). — Short rods, 1-9 ft 

 in length, 74 fi, in width. 



Singly, in pairs and in masses. 

 Motile ; flagellated. 



Colonies circular, granular, yellow. 



Inoculated in the depth of gela- 

 tine they form a filament in the 

 track of the needle and a yellow 

 patch on the surface. 



On agar the growth is golden- 

 yellow, and the same on potato. 



They occur in water. 



Bacillus fluorescens lic[ue- 

 facieus (Flilgge). — Short rods with 

 rounded ends. 



Colonies on plates ' develop an 

 iridescence around them. 



