198 



BACTERIOLOGY. 



Fig. 28. The Germ of Tuberculosis. 



a, ordinary forms found in cultures and sputum (after photo- 

 graphs), about i : 900. 



b, Shows plasmolyzed cell contents, so-called coccothrix forms 

 (i : 1250;. 



c, portion of the edge of a fresh culture of the germ of mam- 

 malian tuberculosis, unstained (about i : 2000). 



d, stained, 1-3, after photographs by F, Fi&chel, i, the germ of 

 aviari tuberculosis from glycerin agar, 2, 3, the germ of mam- 

 malian tuberculosis from egg cultures ; 4, mammalian cultures 

 from glycerin agar, Hayo Bruns. (1-3, about i : 1200 ; 4, i : 1000) 

 e, g, h, Formation of Chlamydospores ; e, mammalian tubercu- 

 losis (after photographs, i : 9000) ; g, from sputum (drawing 

 after Coppen Jones, i : 1250) ; h chlamydospores of Mucor for 

 comparison. jF, branching of filaments (after Coppen Jones), 

 I : 1250 ; at x it can be seen that the vacuoles extend from the' 

 main stem into the side branches, as in k, a hypha of Peniciilium 

 thus showing the existence of " true " branching. 



