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Decalcified portion of natural rock, showing CANAL SYSTEM and the several layers; the acuteness of the planes prevents more than one or two parallel tiers being observed. There are several of these limestones which have been traced to great distances, and one of them is from 700 to 1500 feet thick.
Embedded foreign bodies, on the other hand, such as ivory pegs or decalcified bone, exhibit, on removal after a sufficient interval, evidence of having been eroded, in the shape of worm-eaten depressions and perforations, and do not become united or fused to the surrounding bone.
Nerve-grafting, as a supplementary operation to neurectomy, has been practiced, and Gersung has transplanted the nerves of lower animals to the nerve stumps of man. Bone-grafting is quite frequently practiced, portions from a recently amputated limb, or portions removed from living animals, or bone-chips, may be used. Senn proposed decalcified bone-plates to be used to fill in the gaps.
Intestinal anastomosis, whereby two portions of a severed or resected bowel can be intimately joined, excluding from fecal circulation the portion of bowel which has become obstructed, was originally suggested by Maisonneuve, and was studied experimentally by von Hacken. Billroth resorted to it, and Senn modified it by substituting decalcified bone-plates for sutures.
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