246 BACTERIOLOGY. 



cocci divide first in one and subsequently in two 

 directions, forming characteristic groups, which 

 appear like merismopedia. These groups may 

 eventually consist of 64 x 64 cells or more, and 

 ultimately form zooglcea. The cocci develop again 

 into rods and threads. They were observed in water 

 containing putrefying substances (River Panke, 

 Berlin).* 



Bacterium Pfliigeri, Ludwig. Large, round 

 cocci, mostly in zooglcea, and thread-forms com- 

 posed of rods. They can be cultivated on boiled 

 white of egg and potatoes. They were observed to 

 produce phosphorescence in putrid fish and meat. 



Bacterium photometricum, Engelmann. 

 Cells slightly reddish in colour, motile. The 

 movements are stated to depend on light. 



Bacterium litoreum, Warming. Cells ellip- 

 soidal 2 6 p, long, i "2 2*4 p. wide, occur singly 

 in sea water, never as chains or zoogloea. 



Bacterium fusiforme,Warming. Cells spindle- 

 shaped, with pointed ends, 2-5 p long and -5 '8 /x 

 thick. Observed as a spongy layer on the surface 

 of sea water. 



Bacterium navicula, Reinke and Berthold. 

 Cells spindle-form or ellipsoidal, including motile 

 and non -motile forms. They have one or more 

 dark spots, which may be coloured blue by iodine. 

 They have been observed in rotting potatoes. 



Proteus vulgaris. This and the two following 



* Zopf, Die Spaltyilze. 1885. 



