XVIII.] THE LYMPHATIC SYSTEM. 193 



</. Observe under a low power 



a. The connective-tissue of the capsule 

 surrounding the gland and sending in 



/3. The trabeculae which divide the outer 

 portion of the gland, the cortex, into 

 compartments the alveoli, and which 

 then in the inner portion, split up into 

 bands forming a network with rather 

 narrow, elongated meshes, the medulla 

 of the gland. 



7. In the alveoli of the cortex the roundish 

 masses of tissue crowded with leucocytes, 

 the follicles of the cortex; in the inter- 

 trabecular spaces of the medulla the 

 elongated masses of similar tissue the 

 medullary cords. Note that the folli- 

 cles are continuous with the medullary 

 cords. 



S. Around the follicles and around the me- 

 dullary cords and separating them from 

 the trabeculae the lymph- channels 

 comparatively free from leucocytes. 



I. Observe under a high power 



a. The connective-tissue of the capsule and 

 trabeculse (in some animals e.g. ox, this 

 contains unstriped muscular fibres) con- 

 tinuous with 



f$. The reticulum of the lymph-channels. 

 L. 13 



