32 Synopsis of the Bacteria and Yeast Fungi. 



and also to form a zooglcea {Quart. Jour. Micr. Sci., xviii. 163). Klein 

 describes, I.e., xxiii. 260, a torula-like variety which sometimes passed 

 on the same thread into the typical Bacillus. — Tr.] 



[44. B. tuberculosis, Koch. 



Rods slender, about one-half to one-third of a human 



red blood-corpuscle 



in length, i.e. 3-4 /* 



/ V,» long, and in breadth 



\ ^«^ one-sixth of their 



^ length. Spores not 



/'^ =c/ thicker than the 



threads, about 's /* 



in diameter. (Fig. 



y% a. ^ ' 25.) 

 „.„,,,.,, . In the walls of 



Fig. 25. — Bacillus tuberculosis^ from human sputum, 



prepared by Heneage Gibbes's method ; a X 1200 ; tubcrCUlOUS CavitieS, 



^ '^°°' in the sputum, and 



even in the breath of phthisical patients, in degenerated 

 scrofulous glands, in fungous joints, and in the bones of 

 tuberculous animals (Koch), and in all kinds of tuberculous 

 new formations (neoplasms). 



This was first discovered by Koch, by staining with methylene 

 blue in alcohol, followed by a solution of vesuvin ; the methods of 

 Ehrlich, Baumgarten, and Heneage Gibbes are given in the Appendix, 

 p. I03-] 



[45. B. leprae, Hansen (Virchow, Archiv, 1880, p. 32). 



Rods slender, resembling those of B. tuberculosis, but 

 about 7 /x. broad. Spores not thicker than the threads. 

 (Fig. 26.) 



In the "lepra" formations of the skin, in the liver, 

 the spleen, the testicles, the lymph-glands, the mucous 

 membrane of the mouth, throat, etc., of leprous patients, 



