File:Evolution and disease (1890) (14763649742).jpg

Identifier: evolutiondisease00blan (find matches)
Title: Evolution and disease
Year: 1890 (1890s)
Authors: Bland-Sutton, John, Sir, 1855-1936
Subjects: Diseases Medical genetics Abnormalities, Human Animals Disease Congenital Abnormalities
Publisher: New York : Scribner & Welford
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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e relation to growing antlers thatperiosteum holds to bone (fig. 2). As long as theantlers retain this velvet in a living condition theyincrease in length and thickness ; when the antlers areactively growing they feel warmer to the hand than therest of the body, resembling in this respect an in-flamed part. When in velvet a stag is particu-larly careful not to knock the antlers, for they are verysensitive, and when so unfortunate as to bruise them,a node or swelling forms upon them in every wayresembling nodes on other bones when injured. I haveseen nodes on antlers, caused by blows, as large asoranges. This is illustrated in fig. 3, which is a drawingof a pair of antlers of a roe-deer preserved in themuseum of the Royal College of Surgeons. The leftantler is shorter than the right one and has an ossifiednode upon it as large as a Tangerine orange. After the INTRODUCTION, 7 antlers have attained full dimensions it is difficult forthe circulation to be maintained through so thin a mem-
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Fig. 3.—A pair of antlers from a Roe-deer (Caprcolus capr<za) with anossified node upon them (Mus. Royal College of Surgeons). brane as the velvet, and as a consequence it shrivelsand peels off; the bone beneath is deprived of blood 8 E VOL UTION AND DISEASE. and dies. The branches suffer first and then thebeam. At this stage the antlers become formidableweapons, and the stag, instead of taking every precau-tion not to knock or bruise them, now fears nothing,for they are like dead bone, devoid of sensation. Intime the necrosis extends along the antler until itreaches the pedicle, that part which is covered by thenatural hairy skin of the deer ; in due course a line ofdemarcation is formed by leucocytes, and the antler falls

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