PLATE XVIII. 

 Bacillus tuberculosis. 



FIG. i. 



From a section of a lymphatic gland of a foetal calf. 

 The preparation was stained by the Ehrlich- 

 Koch method (methyl violet and bismarck brown), 

 and eosin. The giant cell takes the eosin stain, the 

 nuclei are stained brown, and the bacilli blue. 

 In the interior of the giant cell are numerous 

 coloured grains, the significance of which is not 

 known, and a number of tubercle bacilli, 

 x 1,500. 



For the material from which this preparation was made 

 the author is indebted to Professor Johne, by 

 whom an account of this case was published, 

 " Ein Zweifelloser Fall von Congenitaler Tuber- 

 kulose," Fortsch. d. Med., 1885, No. 7, p. 198. 



FIG. 2. 



From a section of a lung of a rabbit after inoculation 

 with tubercular sputum. Caseous areas are seen, 

 and masses of bacilli showing distinct beading. 

 Stained by the Ehrlich-Koch method (methyl 

 violet) without a contrast stain. x 1,500. 



