1 82 INFECTION AND IMMUNITY 



of those inoculated, have been repeatedly made by 

 investigators with a negative result. In these in- 

 oculations, blood, pus, and portions of the leprous 

 tissues containing numerous bacilli have been used. 

 In a single instance only was such an inoculation 

 followed by the development of leprosy, but this 

 man belonged to a leprous family and it is not cer- 



FIG. 6. Bacillus of leprosy, as seen in a thin section of a leprous nodule ; 

 magnified 1000 diameters. 



tain that the disease in his case was a result of the 

 inoculation. 



The question as to whether leprosy is contagious 

 has been much discussed by physicians, and while 

 this has been most positively denied by many phy- 

 sicians, and certainly does not occur under ordinary 

 conditions, the opinion seems to be gaining ground 



