226 



THE PATHOGENIC FLAGELLATES 



bacteria on the one hand, and by unquestioned flagellates on the 

 other. 



D. Division of Spirochetes. — In regard to the mode of division of 

 spirochetes the greatest diversity of opinion prevails, and every species 

 whose reproduction is known is interpreted by some as dividing trans- 

 versely, by others longitudinally. As in the case of Spirocheta bal- 

 hianii, it is possible that both methods occur. The greatest number of 



Fig. 90 



Different forms assumed by Treponema pallidum, the organism of syphilis. (After 

 Krzysztalowicz and Siedlecki.) A, three ordinary forms witli "nuclear space" from primary 

 lesion; B, six contracted and ring forms from initial lesion; C, D, E, late stages in condensa- 

 tion of organism from papule; F, minute forms from initial lesion, G to M, successive stages in 

 longitudinal division; A'^, "enigmatical" bodies from an eruptive papule (similar to "cytoryctes 

 luis"). 



observers and the liveliest disputes on this point have been in con- 

 nection with Treponema pallidum, the organism of syphilis (Fig. 90). 

 Without entering into an extensive review of the literature, it may be 

 stated that Krzysztalowicz and Siedlecki ('05) were among the first to 

 describe longitudinal division, which Schaudinn in the same year con- 

 firmed by observations on the living organisms. Herxheimer, Hoifman, 

 Siebert, and others agree with this view. Many others, on the other 



