PLATE II. 



The cutaneous glands and the warts, both with regard to the regions of 

 the body of the adult, and with regard to age. General structure of the skin. 



Fig. 5-9, developmental stages of the toad. X %.* 



Fig. 5. The tadpole just previous to the appearance of gland buds. 



Fig. 6. The tadpole with the first gland buds. 



Fig. 7. The metamorphosed toad just after leaving the water. 



Fig. S. Young toad of the first summer. 



Fig. 9. Toad of the late fall, or just after the first hibernation. 



Fig. 10. Glands from the dorsal surface of the toad just metamorphosed. 

 (Fig. 7) ad, gradation. X 210. 



Fig. 11. Farotid of first summer toad (Fig. 8). Gradation, x 45. 



Fig. 12. Parotid of late fall toad (Fig. 9). Gradation, x 18- 



Fig. 13. Parotid of second year toad. Outer and inner batteries, x 10- 



Fig. 14. Parotid. Outer and inner batteries. X 10. 



Fig. 15. Ventral skin, m-mature gland, x 10. 



Fig. K). Parotid. Ti-ansverse of glands, x 10. 



Fig. 17. Ordinary skin of the back ; epidermis, cutis : a-outer loose, b- 

 compact, c-inner loose strata, pigment, vertical strand ; nerves and blood vessel. 

 X 45. 



Fig. 18. Ordinary skin of the dorsal side of hind legs. Epidermis and 

 cutis. X 45. 



Fig. 19. Ordinary skin of back. Three strata of epidermis. Processes of 

 germinating stratum. Blood loops, x 210. 



Fig. 20. Papilla, ordinary skin of the back. Capillary at base of end 

 bulb. X 210. 



Fig. 21. Wart, and ordinary skin — o. s.— of the back, x 10- 



Fig. 22. Parotid of second year toad, showing growth and transitional 

 glands. X 10- 



Fig. 23. Parotid showing replacement of degenerate glands. Transitional 

 glands are present, x 10- 



Fig. 24. Parotid. Degeneration and replacement. X 10- 



*The magnification of all figures takes into account the plate reduction. 

 Plates II, III, V, and VII are the result of a one-fourth reduction, Plate IV 

 of a one-third reduction, while for Plate VI there was no reduction. 



