42. 



30 Synopsis of the Bacteria and Yeast Fungi. 



to Van Tieghem, it is the action of this saprophyte which causes plant- 

 tissues, immersed in water, to decay. He has even recognised the 

 characteristic traces of its action in the remains of silicified fossil plants 

 of the Carboniferous period ; Ann, Sci. Nat. Bot., ix., 1879, p. 381. 

 -Tr.] 



B. Ulna, Cohn (I.e., i. p. 177). 



Threads broader than in 

 B. subtilis, slightly flexile, with 

 a dense fine-grained plasma. 

 Single cells as much as 10 /n 

 long, 2 ju, broad. Spores ob- 

 long-cylindrical. (Figs. 21, 22.) 



In various infusions, e.g. of 



white of egg. 



Appears to he scarcely different from B. subtilis. Intermediate 

 forms between the two have been observed. 



fn ./■ li..°.V-- .n 



^ir-,e,ii.1l. 



Fig. 7.T..— Bacillus Ulna (after Cohn). 



Fig. 22. — Bacillus Ulna, X 3000 (after Dallinger). 



B. — Pathogknous Species. 



43. B. anthracis, Cohn {I.e., p. 177). 



Exactly like B. subtilis, but motionless and without 



Fig. 23. — Development of Bacillus anthracis from a 'spore, and formation of spores 

 in the threads (after Ewart). 



