Bacillus. 



53 



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

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



Fig. 26. Bacillus lepree. a, cells from tubercles, fresh ; I, a 

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

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

 (a and b, 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 B. tuberculosis^ 



C. CHROMOGENOUS SPECIES. 



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



Rods 6-8 p. thick, scarcely i /x thick, actively motile, 

 isolated or united from two to four together. Dividing rods 

 sometimes shorter, only 34 p. long. Secreting a brick-red 

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

 (Fig. 24.) 



On boiled rice. 



47. B. erythrosporus, Cohn (I.e., iii. p. 128). 

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



