P'ig. 20. The Germ of Tuberculosis. 



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

 tographs), about i : 900. 



b, Shows plasmolyzed cell contents, so-called coccothrix 

 ' forms, (i : 1250). 



<r, portion of the edge of a fresh culture of the germ of 

 mammalian tuberculosis, unstained, (about 1:2000). 



d, stained, i-3,after photographs by F.Fischel, i,the germof 

 avian 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) 

 <?, g, h, Formation of Chlamydospores; ^, mammalian tuber- 

 culosis (after photographs, r 9000); g, from sputum (drawing 

 after Coppen Jones, i: 1250); ^.chlamydosporesof Mucorfor 

 comparison; f t 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 Peni- 

 cillium, thus showing the existence of "true" branching. 



