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The Histology of the Common Frog by Rose B. Ankeny, 1887

The Histology of the Common Frog by Rose B. Ankeny Edgar, 1887, Page 11

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9. -lial layer in the lower portions of which are numerous pigment cells. These pigment cells are distributed generally throughout this external epithelium, being most abundant however int he darker patches of the dorsal surface. The middle layer is thicker than either of the other two. It consists largely of connective tissue and contains numerous irregularly shaped glands, which probably correspond to the perspiratory glands and assist in maintaining the necessary moist condition of the outer surface. The third layer like the first is epi-
 
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