XI.] 



BACILLUS : PATHOGENIC FORMS. 



99 



some possess bright oval spores, and others are more or less 

 beaded, owing to local collections of the protoplasm within 

 their sheath. Neisser and Armauer Hansen have cultivated 





FIG. 65. FROM A SECTION THROUGH THE LARYNX OF A PATIENT DEAD OF 

 LEPROSY. 



Huge cells in fibrous connective tissue ; the cells are filled with the leprosy 

 Magnifying power 600. (Stained with magenta and vesuvin.) 



them artificially in blood-serum and in solutions of meat- 

 extract. Neisser has also shown that the characteristic leprosy- 

 cells .are only wandering cells modified by the growth and 



FIG. 66. BACILLI OF THE SAME PREPARATION AS IN PRECEDING FIGURE. 

 More highly magnified, 1000. 



multiplication in them of the bacilli. In the blood the bacilli 

 do not occur, but they spread probably only by way of the 

 lymphatics. 



H 2 



