116 STUDENTS HISTOLOGY 



(H.) 



5. The histology of the capsule, (a) The closely united con- 

 nective tissue with the scattering elastic fibers of the external 

 layer. (b) The smooth muscle of the deeper portions, (c) 

 Sections of arteries. (These may be of considerable size.) 

 (d) The lymph-spaces. (The differentiation is by the flattened 

 endothelial cells of spaces which otherwise would be supposed mere 

 rifts in the tissue, inasmuch as no definite or special wall can be 

 detected.) 



6. The structural elements of the trabeculae. (They are 

 similar to those of the capsule, excepting the elastic element, 

 which cannot here be demonstrated. Note the variously sectioned 

 small arteries.) 



7. The follicles of the cortex and lymphoid cords of the 

 medulla. (In the thicker section, the field will be completely 

 crowded with lymphoid cells. Select a thin field and observe: (a) 

 The lymphoid cells. (These will be found varying in size from a 



.very small red blood -disc to that of a large white corpuscle; the 

 nucleus is usually large, single or otherwise, while the protoplasm 

 is often scanty.) (&) The branching endothelial cells, (c) The 

 delicate fibrilla? of the adenoid reticulum. (You may endeavor 

 to determine whether this reticulum exists as an offshoot of the 

 endothelial cells, or whether the latter are simply adherent to the 

 broadened plates of the former.) 



8. The reticulum of the lymph-paths. (Observe that this is 

 precisely like the reticulum of the follicles, as demonstrable after 

 shaking out most of the lymph-corpuscles of the last.) (a) The 

 connection between the fibrillae of the paths and those of 

 'the trabeculae. 



9. Capillaries of the paths and cords. (These will be recog- 

 nizable only by the regular succession of the contained red blood- 

 corpuscles.) 



