POSITION OF THE BACILLI 301 



nature. We have, however, no means of testing their powers of 

 resistance. Leprosy bacilli are non-motile. 



Position of the Bacilli. They occur in enormous numbers 

 in the leprous lesions, especially in the tubercular form in fact, 

 so numerous are they that the granulation tissue in sections, 

 properly stained as above, presents quite a red colour under a 

 low power of the microscope (Plate II., Fig! 8). The bacilli 



FIG. 88. High -power view of portion of leprous nodule, showing the 

 arrangement of the bacilli within the cells of the granulation tissue. 



Paraffin section ; stained with carbol-fuchsiu and methylene-blue 

 x 1100. 



occur for the most part within the protoplasm of the round 

 cells of the granulation tissue, and are often so numerous that 

 the structure of the cells is quite obscured (Fig. 87). They 

 are often arranged in bundles which contain several bacilli 

 lying parallel to one another, though the bundles lie in various 

 directions (Fig. 88 and Plate II., Fig. 9). The appearance thus 

 presented by the cells filled with bacilli is very characteristic. 

 Bacilli are also found free in the lymphatic spaces, but the greater 

 ii'imber are undoubtedly contained within the cells. They are 



