THE SALIVA. 



123 



geneous muco-serous fluid not exhibiting any features to the 

 microscope ; but as it occurs in the mouth it contains a few 

 adventitious elements, those derived from the local tissues 

 being epithelium-cells, leukocytes, and salivary corpuscles; 

 while bacteria, fungi, food-particles, and other foreign objects 



FIG. 52. 



Section through crypt of tonsil (Stohr). e, epithelium ; /, lymphoid follicles ; , 

 material within the crypt, composed partly of escaped lymphoid cells. 



of extraneous origin may be present. The epithelial cells 

 present are large transparent squamous cells with prominent 

 nuclei and coarse granules in the body of the cell ; their edges 

 are often curled. The leukocytes that may be present are 

 such as have wandered from the bloodvessels. The salivary 

 corpuscles are lymphoid cells escaped into the mouth from the 



