DESCRIPTION OF SPECIES. 



507 



^^^^ 



a shining white growth 

 a,long the needle track 

 which sends off long 

 rounded processes. 



On agar, glycerine agar 

 and blood serum they 

 produce a luxuriant white 

 shining growth. 



Broth becomes turbid 

 with a whitish deposit and 

 pellicle. 



On potato there is a thick 

 moist brown growth. 



They are found in water. 



Bacillus cyaneo-fuscus 

 (Beyerinck). — Rods '2 to -6 

 ,/i in length, and half their 

 length in width. Motile. 



In the depth of gelatine 

 they produce colonies in 

 the track of the needle, 

 -which later develop a black 

 pigment. 



In broth with ^ per cent, 

 of peptone they produce a 

 blue colour, changing to 

 brown and finally black. 



They were isolated from 

 cheese, size and glue. 



Bacillus cyaneo-phospliores- 

 ^lens (Katz). — Rods 2-6 /i in length, 

 1 /i. in width, singly, in pairs, and 

 filaments. Colonies circular and 

 brownish or greyish-yellow. 



Jnoculated in the depth of gela- 

 tine they form a grey-white fila- 

 ment in the track of the needle and 

 liquefaction follows at the upper 

 part ; later a skin forms on the sur- 

 face and a yellow deposit occurs at 

 the bottom of the liquefied jelly 

 -which has a reddish-brown tinge. 



In broth a similar skin floats 

 on the surface and the broth is 

 turbid. 



On sterilised fish the growth is 

 viscid and yell6w. 



Cultures are phosphorescent, 

 especially in media containing 

 excess of common salt. 



They were isolated from sea- 

 water at Sydney, and are possibly 

 identical with Bacillus phosphores- 

 ■cens of Fischer. 



Bacillus cyauogenus (Hueppe). 

 — Bacterium syncyanum. Bacillus 

 ■of Blue Milk. — Motile rods, 2'5 to 



/l^' 



'<{'/ 



Fig. 200.— Bacillus cyanogenus, x 650. A. Ac- 

 tive rods. B. Rods in zooglcea. C. Chain of 

 short rods. D. Chain of cocci. E. Cocci stage. 

 F, G. Spore-forming rods. H. Involution- 

 forms (Neelsen). 



3'5 /i in length, and '4 fi wide (Fig. 

 200). The rods after division may 

 remain linked together, and form 

 chains. Non-motile rods occur 

 enveloped in a gelatinous capsule, 

 and involution forms. 



Colonies appear after two days 

 as small greyish-white points which 

 gradually assume a moist appear- 

 ance. The gelatine becomes steel- 

 grey, throwing the white colonies 

 into strong relief . 



In the depth of gelatine a whitish 

 growth appears in the track of the 

 needle near the upper part, and on 

 the free surface, producing also a 

 dark steel-blue discoloration of 

 the jeUy which spreads down- 

 wards. 



On agar a greyish growth ap- 

 pears, and the agar is coloured dark 

 brown. 



On potato a yellowish moist 

 growth develops, the potato around 

 it is stained grey-blue. Milk be- 

 comes slightly alkaline and of a 

 slate-grey colour, which on the 

 addition of acid changes to an 

 intense blue. Milk in which the 



