PLATE 6i. 



Mycobacterium tuberculosis (Koch). Lehm. and 

 Neum. (Tubercle Bacillus.) 



I. Glycerin-agar streak culture, fourteen daj^s at 37°. 

 II. Glycerin-agar streak culture, forty days at 37°. 



III. Potato culture, forty days at 37°. 



IV. Colonies of tubercle bacilli from a blood-serum cul- 

 ture. X 700. (Copied after R. Koch, Aetiologie der Tuber- 

 kulose. Mitteilungen des Kaiserl. Gesundheitsamt, Bd. 2, 

 Taf. IX, 44.) 



V. Culture, upon blood-serum, from a piece of a freshly 

 extirpated scrofulous gland. (Copied like the above, Bd. 2, 

 Taf. IX, 44.) 



VI. Giant cell with radially arranged bacilli. From a 

 caseous bronchial gland in a case of miliary tuberculosis. 

 (Copied like above, Bd. 2, Taf. ii, 9.) 



VII. Microscopic preparation. Pure culture, stained 

 according to Ziehl. X 1000. 



VIII. Branching of tubercle bacilli. (Copied after Hayo 

 Bruns, C. B. xvii. No. 23.) 



IX. Microscopic preparation. Sputum, stained accord- 

 ing to Ziehl. X 1000. 



X. Single bacteria, highly magnified. 



X. 



