228 



ELEMENTARY PHYSIOLOGY 





Fig. 68. — A Diagram to illustrate the Stuccture ut Glands, 



A. Typical struct\ire of tlie iiiurnus membrane, a, an upper, and 6 a 

 lower, layer of epithelium cells ; c, the dermis with c a blood-vessel, 

 and /, connective tissue corpuscles. 



