. A manual of zoology. Zoology. GENERAL HISTOLOGY 67 changes of form, become the superficial layers, here to replace an equal quantity of worn-out cells (fig. 27). In the course of this change of position, the cells may undergo an altera- tion; in the reptiles, birds, and mammals (fig. 2S) they Ijecame cornified, first the margins, then the inner part of the cell, changing into horn {'keratin'). The nucleus remains for some time, but at length this vanishes,. 27.—Section tVirough the skin of Petro- myzon planeri. Ep, the many-layered epithelium of the epidermis, including B, goblet cells; Ko,
. A manual of zoology. Zoology. GENERAL HISTOLOGY 67 changes of form, become the superficial layers, here to replace an equal quantity of worn-out cells (fig. 27). In the course of this change of position, the cells may undergo an altera- tion; in the reptiles, birds, and mammals (fig. 2S) they Ijecame cornified, first the margins, then the inner part of the cell, changing into horn {'keratin'). The nucleus remains for some time, but at length this vanishes,. 27.—Section tVirough the skin of Petro- myzon planeri. Ep, the many-layered epithelium of the epidermis, including B, goblet cells; Ko, granular cells; Ko, club-cells; Co, corium (^^^th blood-vessels, C), consisting of bundles of fibrils running horizontally (IF) and vertically (5) (from Wiedersheim).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
