362 



MICRO-ORGANISMS AND DISEASE [chap. 



and clinical) signs are wanting. And although the results 

 of the use of tuberculinum for diagnostic purposes are not 

 absolutely uniform, they are nevertheless sufficiently striking 

 to consider such use as of paramount importance. 



Badllus Lepra:. — Armauer Hansen ^ first ascertained the 

 existence of large numbers of minute bacilli in the peculiar 



Fig. 142. — Fro.m a Section- throlt.h Leprous Skix, sho\\i.\g the Leprosy 



ti.\CILLI. (E, C. BOUSFIELD.) 



X 1000. 



large leprosy-cells of Virchow, which constitute the nodules 

 of leprous patients. Neisser^ confirmed this, and con- 

 siderably extended our knowledge of the bacilli, showing 

 that they can be readily slained with fuchsin or with 

 Ehrlich's acid solution of eosin-hfematoxylin. The bacilli 



^ Virchoiv' s Archii\ vol. Ix.xix. ; and Quarl. Jojti}!. of Micro. Sci. 

 iSSo. 



° Breslauer drz/l. Zeitschr.. xx. and xxi., 1S77, and I'lrc/iow's Airhiv, 

 84. 



