FORMS OF GLANDS. 



261 



FIG. 88. Forms of glands. A, a simple secreting surface ; a, its epithelium ; 

 6. basement membrane ; c, capillaries ; B, a simple tubular gland ; C, a secret- 

 ing surface increased by protrusions ; E, a simple racemose gland ; D and <?, 

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

 and C, the capillaries are omitted for the sake of clearness. H, half of a highly 

 developed racemose gland ; c, its main duct. 



