CLASSIFICATION AND DESCRIPTION OF SPECIES. 



479 



basis for classification into genei-a or species. The mode of repi-o- 

 dnctiou is not sufficiently known to afford a better means for 

 distinction than the other morphological appearances taken alone ; 

 nor can we depend upon phyaological action, which is held by 

 many to vary with the change of form, according to altered 

 surroundings. 



Fig. 196, 



CiADOTHETS SicHOTOMA. — A. Branched Schizomyoete : (a) Vibrio-form : (6) Spii-il- 

 Iiua-fonu [slightly magnified]. B. Sctew-form at the ends : («) Spirillum- 

 form ; (6) "^Ittio-fonn. C. Very long Spirochteta-form. D. Branch frs^ment, 

 at one end Spirillimi-form, at the other Vibrio-form. E. Screw-form : 

 (a) Continuoas; (6) Composed of rods; and (c) Cocci. F. Spirochseta-form : 

 (a) Continuous : (6) Compoeed of long rods j (e) Short rods ; and (d) Cocci 

 (Zopf). 



Zopf, who has warmly supported the pleomorphism of bacteria, 

 has suggested as a result of his investigations a division of the 

 Schizomycetes, SpaltpUze, or Eission-fungi, into the following four 

 groups : — 



