. The American beaver and his works. Beavers. 50 THE AMERICAN BEAVER. elles se separent aisement apres la mort de ; Thin longitudinal and transverse sections exhibit the true character of this structure. The tail is com- posed largely of a dense fatty tissue; upon this lies the derm or skin, 07'" in thickness, its outer sur- face being serrated, with the points of the serratures toward the end of the tail. Over the serratures is ex- tended the tough horny epiderm, gs" to ^V in thick- ness, which is inflected under the serratures, so as to present the imbricate appearance
. The American beaver and his works. Beavers. 50 THE AMERICAN BEAVER. elles se separent aisement apres la mort de ; Thin longitudinal and transverse sections exhibit the true character of this structure. The tail is com- posed largely of a dense fatty tissue; upon this lies the derm or skin, 07'" in thickness, its outer sur- face being serrated, with the points of the serratures toward the end of the tail. Over the serratures is ex- tended the tough horny epiderm, gs" to ^V in thick- ness, which is inflected under the serratures, so as to present the imbricate appearance. The longitudinal divisions are merely dips or depressions, not imbricate. Fig. Longitudinal section of scaly tail, twice the natural size. The beaver, being an aquatic as well as a land ani- mal, presents two types of structure. The arms and hands are small, are adapted to burrowing, and, being capable of partial supination, the hands may be used for holding substances between them. The hind ex- tremities are strongly developed, and are constructed after the aquatic type. The feet have been compared to those of the turtle. Each extremity has five digits. The back of the hand is thickly covered with short hairs; the palm is naked, with a tough black epi- dermis, and two tubercles, one opposite the fifth fin- ger, the other under the metacarpals of the second, third, and fourth. The fingers are furnished with long claws, of which that of the third finger is the longest, 92'" long, and 20'" broad. The first finger (thumb) is shorter than its claw. Next in length is. 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 Morgan, Lewis Henry, 1818-1881. Philadelphia, J. B. Lippincott & Co.
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherphiladelphiajblipp
