28 SPIROCH^TES. 



seen. A single terminal nodule has been noted, for 

 example, in Sp. duttoni (Button, Todd and Tobey), Sp. 

 pallida (Dudgeon), Sp. pertenuis (Castellani) , and in 



FIG. 20. FIG. 21. 



FIG. 20. Spirochaete of ulcerating cancer (left) and Sp. refringens 

 (right), with terminal nodules. (Schaudinn.) 



PIG. 21. Spirochaeta pertenuis with terminal granules. 

 (Castellani.) 



many other forms (Figs. 20, 21, 22, 23). Two nodules 

 may be placed toward the same extremity (e.g., Sp. 

 aboriginalis, Bosanquet) . One or more of such dots or 

 masses may also be seen (Figs. 24, 25), in the central 





FIG. 22. FIG. 23. FIG. 24. FIG. 25. 



FIG. 22. Spirochasta aboriginalis with granules and "loop." 

 (Bosanquet.) 



FIG. 23. Spirochaeta duttoni. Injured specimen. (Schellack.) 



FIG. 24. Spirochaeta duttoni, with masses of staining sub- 

 stance. Supposed to represent nuclei. X22oo. (Mayer.) 



FIG. 25. Spirochaeta lagopodis, showing dots resembling nuclei. 

 (Fantham.) 



part of the organism. These have been supposed to 

 represent nuclei, and Herxheimer has indentified a 

 kineto-nucleus, a tropho-nucleus and centrosome a 



