PLATE III. 



Developmental stages of the cutaneous glands, found in the adult ; batteries 

 and gradation. 



Fig. 25. Parotid. Batteries : a-inner, b-transitional, e-outer. Epidermis ; 

 cutis ; outlet of glands, x 34. 



Fig. 2G. Gland bud, ordinary skin of the back near parotid. X -1^^- 



Fig. 27. Undifferentiated gland, parotid, x 210. 



Figs. 28-32. Glands of outer battery, parotid. Gradation, x -10. 



Figs. 33-35. Gland of outer battery, parotid. First (34), third (35), fifth 

 (33), sections of same gland. Fig. 34 shows the longitudinal view of smooth 

 muscle fibers, and in the other two the muscle fibers are cut transversely, and 

 appear in some cases as triangular cells at the base, x 210. 



Figs. 36 and 37. Glands of transitional battery, parotid. X 210. 



Figs. 38-41. Glands of transitional battery, with sections of large mature 

 glands of inner battery, parotid. Figs. 38 and 39 are different sections of 

 the same gland. X 45. 



Fig. 42. Mature gland of medium size, inner battery, parotid. X -ly- 



