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CHAPTER IV. 



PROTEAN AND LITTLE-KNOWN SPECIES. 



The present chapter will include those described Schizo- 

 mycetes which are inadequately known, or the true bacterial 

 nature of which is undecided, together with those Zopfian 

 species which could not be placed in the Cohnian classi- 

 fication. 



BACTERIUM. 



93. B. Zopfii, Kurth {Ber. Deutsch. Bot. Gesell., i., 

 1883, pp. 97-99. Pl- iii)- 



Observed in three forms, long leptothrix threads, rods, 

 and cocci. In the fluid nutrient material at 20° C. the 

 rods passed into a swarming stage, and at 35° C. the swarm- 

 ing motion ceased, and short oscillating threads were 

 formed. When the nutrient material was nearly exhausted, 

 the threads broke up into rods, and when it was quite 

 exhausted, each rod divided into two cocci, which for the 

 most part remained united in a figure of eight. Wlien 

 placed in fresh nutrient material, the cocci grew again into 

 rods. Division of the cocci was never observed ; they were 

 round or slightly oval, and i-i"25 ju, in diameter. 



In the vermiform appendage of two hens which had died 

 of an epidemic disease. The threads were distinguished by 



