Bacillus. 



33 



but, as it appears, not in the kidneys or the blood. The 

 " brown elements " always found in old tubercles are pro- 



'l/liiilUll/ i 



i: 



^ I 



Fig. 26. — BaciUus lepra, u, cells from tubercles, fresh ; i, a 

 " brown element " coloured with methyl-violet, from a 

 tubercle treated with osmic acid; c, bacilli, with spores 

 (jz and 3, after Hansen ; c, after Neisser). 



bably agglomerations of spores and spore-forming Bacilli. 

 This species is acted upon by staining agents in the same 

 way as £. tuberculosis^ 



C. — Chromogenous Species. 



46. B. ruber, Frank et Cohn {I.e., i. p. 181). 



Rods 6-8 /i thick, scarcely i /a thick, actively motile, 

 isolated or united from two to four together. Dividing rods 

 sometimes shorter, only 3-4 /^ long. Secreting a brick-red 

 pigment, which is different from that of M. prodigiosus. 

 (Fig. 24.) 



On boiled rice. 



47. B. erythrosporus, Cohn (/.<:., iii. p. 128). 



Motile, short, slender rods, partly forming longer threads, 



