550 



DESCRIPTION OF SPECIES. 



of this process a chain of cocci 

 results, encased in a cylindrical 

 or ellipsoidal envelope. The chains 

 increase in length, become twisted 

 up, and eventually fall apart into 

 pieces of various lengths. 



In nourishing liquids a great 

 number of little masses are formed, 

 which adhere together, and produce 

 pseudo-parenchymatous structures. 

 These latter may join together, 

 forming still larger agglomerations. 



This micro-organism occurs occa- 

 sionally in beet-root juice and the 

 molasses of sugar-makers, forming 

 large gelatinous masses resembling 

 frog-spawn. The vegetation is so 

 rapid that forty-nine hectolitres of 

 molasses, containing 10 per cent, 

 of sugar, were converted within 

 twelve hours into a gelatinous 

 mass ; consequently, it is a for- 

 midable enemy of the sugar manu- 

 facturers. 



FIG. 219. LEUCONOSTOC MESENTEROIDES. 



1. Spores. 2. Spores after germination, showing gelatinous envelope. 3, 4, 5, 6. 

 Increase by division. 7. Glomerular form of zooglcea. 8. Section of an old 

 mass of zooglcea. 9. .Cocci chains with arthrospores (Tieghem and Cien- 

 kowski). 



The masses of zooglcea are of \ 



almost a cartilaginous consistency, I 



and admit of sections being made | 



with a razor. After a long time ! 



the envelope liquefies, and the cocci ! 



are set free ; the latter introduced j 



into fresh nourishing media develop j 



new colonies. In the chains some | 



of the cocci become enlarged with- i 



out changing their form. These j 

 acquire the properties of spores, 

 and 



Micrococcus acidi lactici 



(Marpmann). Large cocci, singly 

 and in pairs. 



Colonies yellowish-white. 



On the surface of gelatine the 

 cocci produce a yellow layer. 



They grow in milk, producing a 

 reddish colour, and coagulation due 

 to the formation of lactic acid. 



They were isolated from milk. 



Micrococcus acidi lactici lique 

 faciens (Kreuger). Cocci oval, 1 



