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. Set. Nat. Bot., ix., 1879, p. 381. 

 -TR.] 



42. 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 p. 

 long, 2 p. broad. Spores ob- 

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

 In various infusions, e.g. of 



Fig. -.-Bacillus Ulna (after Cohn). 



Appears to be scarcely different from B. subtilis. Intermediate 

 forms between the two have been observed. 



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



B. PATHOGENOUS SPECIES. 



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



Exactly like B. subtilis, but motionless and without 



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

 in the threads (after Ewart). 



