. On the anatomy of vertebrates [electronic resource] . November 7th, 1865:the shed sheath was 8 in. long,and showed an obtuse begin-ning of the lower prong of thefork, fig. 493, A, c. Thedermo-perioste of the core doesHI not lose its vascularity : theshedding of the agglutinatedfibres of the sheath, like thatof the ordinary hair, is due to the obliteration of the matrices ofthese fibres and their extrusion from the dermo-perioste; which,in the meanwhile, has begun to develope a new coat of fibres, ib. , on the shedding of the old mass, appear as an abundantcovering of long, straight, s
. On the anatomy of vertebrates [electronic resource] . November 7th, 1865:the shed sheath was 8 in. long,and showed an obtuse begin-ning of the lower prong of thefork, fig. 493, A, c. Thedermo-perioste of the core doesHI not lose its vascularity : theshedding of the agglutinatedfibres of the sheath, like thatof the ordinary hair, is due to the obliteration of the matrices ofthese fibres and their extrusion from the dermo-perioste; which,in the meanwhile, has begun to develope a new coat of fibres, ib. , on the shedding of the old mass, appear as an abundantcovering of long, straight, silky and light-coloured hairs, ib. d,the growth of w hich mechanically uplifts and pushes off the oldsheath. The new sheath, 4 inches long when so exposed, grewto 6 inches in the course of three weeks, at which time the fibreshad begun to felt or agglutinate into a compact horn at the sum-mit, fig. 493, B, e> Dr. Canfield observed in a young yearling male Prong-buck,which he had captive, at Monterey, California, the growth of the 1 ccxxiv. p. Shedding and formation of horny sheath of horn,Antilocapra Americana, ccxxiv. HORNS OF MAMMALIA. 627 first pair of horns commencing in July (1855), and attaining thelength of -fths of an inch and the form of a mammillary knob ;the sheath was shed, early in December, leaving the core -J aninch long, and covered by fine silky hairs : in a week the agglu-tination of the summit into compact horn commenced. In Oc-tober 1857, the animal being two years and a half old, the hornswere 9 inches long, and the anterior prong was indicated by aprotuberance, as in fig. 493, A, the agglutinate tip of which soonbecame confluent with that of the main stem. The phenomenanoted between 1855 and 1857 indicated an annual shedding ofthe It is probable that such takes place, also, inthe fully-formed horn and, in the month of November, as The Giraffe has a pair of small, short, cylindroid unbranchedhorns which consist of bone covered b
Size: 1773px × 1409px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubject, booksubjectbirds, booksubjectfishes
