20 



MORPHOLOGY 



FIG. 13. Spirochaete plicatilis. (On left.) Spirochaete 

 obermeieri. After Schmidt and Weis. 



er's comma when stained. Long, closely coiled spirals are 

 called spirochates by some writers (Fig. 13). A true spirillum 



is rigid and shows itself 

 on a slide as a semicircle 

 of spirals (Fig. 14) ; a 

 spirochate is a continu- 

 ous line of spirals which 

 often attain great length, 

 and a microspira or vibrio 

 is a short, curved rod 

 similar to a comma. 

 The spirillum and vibrio 

 are rigid, and the spiro- 

 chaete is usually a flexible 

 spiral. 



The size of a spirillum 

 varies from 0.3 micron to 



N: <3Jk 



FIG. 14. Spirillum, sanguineum . 

 Schmidt and Weis. 



After 



20 or 30 microns in 



