40 SPIROCILETES. 



Oval forms were found by Leuriaux and v. Geets 

 in Sp. pallida; they suggest that these develop subse- 

 quently into filaments. Ovoid bodies are also depicted 

 by Krzystalowicz and Siedlecki as apparently constitut- 

 ing a stage in Sp. pallida (see Fig. 50), and somewhat 

 similar bodies were found by Castellani along with Sp. 

 pertenuis. 



Sporulation. In the case of Sp. anodontce I have 

 found some specimens showing about the middle of the 

 body a rounded swelling or a darkly staining oval body 



FIG. 47. FIG. 48. 



FIG. 47. Spirochaeta balbianii, with central swelling (so-called 

 " male" form). (Perrin.) 

 FIG. 48. Arabian spirochaete. (Carter.) 



(Fig. 46) suggestive of a "resting spore." In figure 

 460 is depicted for comparison a portion of a filament 

 of cladothrix showing a very similar swelling. These 

 appearances may be compared with the illustrations 

 given by Perrin of peculiar forms of Sp. balbianii (Fig. 

 47), and also Carter's figures of his Arabian spirochaete 

 (Fig. 48). 



Cox states that within the blood-corpuscles Sp. 

 obermeieri breaks up into minute granules; and Leish- 

 man finds that Sp. duttoni gives rise to coccoid forms 

 within the tick, no spirochaetes being discoverable within 

 ticks which are yet capable of conveying the infection. 

 The so-called "moniliform" specimens of spirochaetes 

 (Fig. 27), are usually looked upon as degenerative forms 

 but it is possible that the granules thus formed are cap- 

 able of subsequent development, and are the equivalent 



