150 IMPORTANT VARIETIES OF FISSION-FUNUI. 



The luxuriant, waxy, shining masses consist of dense zooglea of 

 streptococci which are surrounded by very extensive, enormously 

 swollen capsules, which do not stain with anilin dyes. The capsule 

 formation occurs best upon calves' serum, but is also seen upon sheep's 

 serum. 



2. Upon plates prepared with 10 c.c. of agar, and 2 c.c. of serum, l both 

 warmed to 40°, there is found about each of the small pure growths a 

 halo of strongly refracting granules, which are doubtless composed of 

 the same material as forms the capsules of the single cells. How these 

 spheres originate and whence they arise, Kurth is unable to say. 



Kurth had already stated that the Micr. pyogenes and Micr. tetra- 

 genus can furnish similar pictures upon calves' but not upon sheep's 

 serum. He found later that also streptococci not connected with 

 foot-and-mouth disease, although rarely, furnish similar serum cul- 

 tures. The organism has nothing to do with foot-and-mouth disease 

 (see Appendix). 



Streptococcus Mesenterioides (Cienkowski) Migula. 



Synonym. — Leuconostoc mesenterioides Cienkowski. 

 Ordinary Name. — Frog-spawn fungus of sugar factories. 



Literature. — Zopf and Liesenberg, " Beitrage zur Physiol, u. 

 Morph. niederer Organismen, " Heft. I, Leipzig, 1892 ; C. B. XII, 659. 



The organism grows upon nutrient media free of grape- 

 and cane-sugar, like the Strept. pyogenes 2 microscopically 



Fig. 14. — Strept. mesenterioides (after Zopf). 



and macroscopically ; in a stab of gelatin containing grape- 

 or cane-sugar, on the contrary, it grows upon the surface 

 as a luxuriant deposit consisting of dense, whitish, jelly- 

 like clumps, which possess a ' * strong glassy luster at the 



1 The serum must not be sterilized with chloroform, but only by 

 heat. 



2 Liesenberg and Zopf call these forms Strept. mesenterioides var. 

 nuda. 



