GENERAL MORPHOLOGY AND PHYSIOLOGY. 135 



It is not impossible that these ovoid granules are 



spores, which, in their 



behaviour towards staining 



reagents, thus form an 



exception to the general 



rule. But there can be ^~" 



little doubt that a tubercle ^^* 



\ TV 



bacillus consists, for the % 



most part, of a very delicate 



FIG. 58. TUBERCLE BACILLI IN 



sheath, with protoplasmic SPUTUM, x 2500 (from photo- 



contents which have a great 



tendency to be broken up or coagulated into little 

 segments or roundish granules, owing 

 possibly to the treatment they are sub- 

 jected to in making a microscopical 



FIG. 59. . ^. . , , 



LEPROSY BA- preparation. This, however, does not 

 CILLI, FROM always occur, for the bacilli at times are 



A SECTION . . 



OF SKIN, not beaded, but are stained in their en- 

 tirety. In the leprosy bacilli a similar 

 appearance occurs. In stained sections the rods 

 have a beaded appearance, but the 

 intervals between the granules are 

 sometimes very long, and occasion- 

 ally the protoplasm appears to have 

 collected only at the extreme ends FIG. 60. 



of the rod (Fig. 59). Very probably 



the appearances in the case of the OF A GLANDERS 



T -11 r i j /T- s \ j NODULE, x 1200. 



bacillus of glanders (Fig. 60), and 



the bacterium of chicken-cholera (Figs. 61 and 62) 



may be similarly explained. 



