ix.] Viscous fermentation. Leuconostoc. 91 



filiform row of isodiametric cells is formed by the growth and 

 successive transverse division of the protoplasmic body, and the 

 envelope follows the longitudinal growth of the cells, forming a 

 thick, rounded, cylindrical sheath of the consistence of firm gela- 

 tine round the filament. The transverse walls also of the filament 

 in its young state are gelatinous, appearing as broad pellucid 

 partitions between the protoplasmic bodies and being continued 

 into the sheath on the outside (f-i}. The partitions disappear 

 in older filaments and the protoplasmic bodies are in contact 



Fig. ii. 



with one another (b). As the single filament developed from 

 a spore increases in length it forms successively stronger curva- 

 tures, which lay themselves in loops round each other and round 



Fig. ii. Leuconostoc mesenterioides, Cienkowski. a sketch of a Zoogloea. 

 b section through a full-grown Zoogloea before the commencement of spore- 

 formation, c filament with spores from an older specimen, d isolated ripe 

 spores, e-i successive products of germination of the spores sown in a 

 nutrient solution. Order of development according to the letters. In e the 

 two lower specimens show fragments of the ruptured spore-membrane on 

 the outer surface of the gelatinous envelope indicated by dark strokes. 

 i portion of the gelatinous body from h divided into short members, and 

 with the members separated from one another by pressure, a natural size, 

 other figures magn. 520 times. After van Tieghem in Ann. d. Sc. nat. 

 ser. 6, VII. 



