84 Synopsis of the Bacteria and Yeast Fungi. 



their unusual length, forming long windings, and occasionally 

 close coils. It is interesting to observe that the stages of 

 development appeared to depend upon the quantitative 

 composition of the nutrient fluid, and that the rods were 

 the vegetative and the cocci the resting form. (Fig. 72.) 



Fig. 72. Bacterium Zopfii. a, a coil of leptothrix threads; 

 b, the same coil, nine hours later ; c, the same, thirty-seven 

 hours later than b; d, short rods, showing articulations, 

 X 740 (after Kurth). 



94. B. merismopedioides, Zopf (Sitz.-Bericht. Bot. 

 Ver. Provinz Brandenburg, and " Die Spaltpilze," 

 P- 56). 



This species forms threads of i-i'S ^ in thickness. 



These subdivide into long rods, then into short ones, and 



finally into cocci, which have the same diameter as the 



threads. The cocci pass through a motile 



8 8 sta ge, and then subdivide, at first in one 



by OD 



Fig. 73 .- Bacterium direction, and then in two, thus forming 

 merismopedioides t ^ e characteristic unilamellar plates, which 



(after Zopf). 



resemble Merismopedia. These colonies 

 may increase till they consist of 64 X 64 cells or more, 

 which finally form a zoogloea. The cocci develop again 

 into threads. (Fig. 73.) 



In water containing putrefying substances. 



