XI.] 



BACILLUS : PATHOGENIC FORMS. 



137 



are also present in the interstitial tissue of the nervous 

 branches in the anaesthetic variety of the disease. 1 Some 

 bacilli are motile, others not ; 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 them artificially in 



FIG. 70. 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 



bacilli. 

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



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 multipli- 

 cation in them of the bacilli. In the blood the bacilli do 



1 Compare also Cornil, Union Medicale, 1881, Nos. 178, 179, and 

 Babes, Archives d. Physiokgie, July, 1883. 



