66 IMMUNITY IN HEALTH 



glandular lymphocytes in the superficial layer of lym- 

 phatic nodules and especially in the larger glandular 

 lymphocytes in the centres of the deep layer of lym- 

 phatic nodules. There may be from one up to a score 

 or more of bacilli in a single cell. They lie apparently 

 within the cytoplasm, outside the nucleus. Some of 

 the bacilli are poorly or irregularly stained, appearing 

 as faint ghosts with perhaps one or two dark spots in 

 their length. A number of the lymphocytes contain 

 no bacteria. 



I have sometimes seen intracellular bacteria in the 

 efferent lymphatic vessels of the tonsils and other sub- 

 epithelial lymphatic glands in various animals, and 

 Butterfield (1913) describes the " perivascular lymph- 

 atics " of human tonsils as often " filled with micro- 

 organisms." 



