THE SECRETORY TISSUES AND ORGANS. 285 



epithelium which is merely protective and differs in charac- 

 ter from the secreting epithelium which lines the deepest 



FIG. 104. Forms of glands. A. a simple secreting: surface ; a. its epithelium ; 

 b, basement membrane ; c, capillnries ; B, a simple tubular gland ; C, a secreting 

 surface increased by protrusions ; E. a simple racemose gland ; D and Gr, com- 

 pound tubular glands ; F, a compound racemose gland. In all but A, B, and C 

 the capillaries are omitted for the sake of clearness. H, halt of a highly developed 

 racemose gland ; c, its main duct. 



parts. Surrounding each subdivision and binding it to its 

 neighbors is the gland stroma formed of connective tissue, a 



