XVIII] LYMPHATIC SYSTEM 147 



6. Shake one or two sections of lymphatic gland with water 

 in a test tube to get rid of most of the leucocytes, stain with 

 picrocarrnine and mount in glycerine. 



In this section observe (h. p.) the network of fine fibres of 

 the adenoid tissue. 



7. Section of lymphatic gland (Flemming's fluid), stain with 

 saffrariin (cp. p. 286). Note the leucocytes with deeply stained, 

 dividing nuclei, chiefly in the germinal areas. 



DEMONSTRATIONS. 



1. Section of small lymphatic gland 1 with blood 

 vessels injected. The arteries enter at the hilus sur- 

 rounded by connective tissue and branch in the 

 trabeculae of the gland ; from the smaller of these 

 branches fine arteries run to the follicles and medullary 

 cords and form in them a capillary network ; no capil- 

 laries occur in the lymph- channels. The veins have a 

 distribution similar to that of the arteries. 



2. Transverse section of thoracic duct. Note the 

 similarity in structure to that of a vein (cp. p. 133). 



3. Specimen to show injected lymphatics of tendon 

 of diaphragm. 



4. Section of tonsil including the surface epithe- 

 lium. Note (1. p.) the stratified epithelium dipping 

 down here and there and so forming crypts; the 

 lymphatic tissue, showing roundish germinal areas, 



1 For lymphatic follicles and Peyer's patch of intestine, see 

 Less. xxn. 



102 



