DESCRIPTION OF SPECIES. 



507 





a shining white growth 

 along the needle track 

 which sends off long 

 rounded processes. 



On agar, glycerine agar 

 and blood serum they 

 produce a luxuriant white 

 shining growth. 



Broth becbmes turbid 

 with a whitish deposit and 

 pellicle. 



On potato there is a thick 

 moist brown growth. 



They are found in water. 



Bacillus cyaneo-fiiscus 

 (Beyerinck).— Rods "2 to "6 

 ./I in length, and half their 

 length in width. Motile. 



In the depth of gelatine 

 iihey produce colonies in 

 the track of the needle, 

 which later develop a black 

 pigment. 



In broth with J 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- 

 cens (Katz). — Kods 2-6 /i in length, 

 1 ^ in width, singly, in pairs, and 

 filaments. Colonies circular and 

 brownish or greyish-yellow. 



Inoculated 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 yellow. 



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. 



BaciUus cyanogemis (Hueppe). 

 — Bacterium syncyanum. Bacillus 

 •of Blue Jfilh. — Motile rods, 2-5 to 





i\j 



V 





\^i 



Fig. 200. — Baoilhis oyanogencs, x 650. A. Ac- 

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

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

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

 forms (Neelsen). 



3'5 fi in length, and 4 )i 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 jelly 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 



