The Dental record . complete, and I onlypropose at present to call attention to some of the more obvious pointswhich they exhibit. In all the specimens a close organic union between the tooth andthe alveolar periosteum, or rather that portion of it in the immediateneighbourhood of the tooth, is perfectly evident; and in some of thesections the osteogenetic layer of that tissue with its stratum of osteo-blasts next to the cement is quite distinct. There is also in somecases undoubted evidence of a new formation of cementum in actualprocess. Dr. Hayes has been kind enough to photograph a spotin
The Dental record . complete, and I onlypropose at present to call attention to some of the more obvious pointswhich they exhibit. In all the specimens a close organic union between the tooth andthe alveolar periosteum, or rather that portion of it in the immediateneighbourhood of the tooth, is perfectly evident; and in some of thesections the osteogenetic layer of that tissue with its stratum of osteo-blasts next to the cement is quite distinct. There is also in somecases undoubted evidence of a new formation of cementum in actualprocess. Dr. Hayes has been kind enough to photograph a spotin a section taken from a tooth where this is well shown. Theperiodontal tissue here appears to be normal and without any inflam-matory cellular hyperplasia. Towards the apex of the root, however,we sometimes see the old cement and the dentine of the tooth under-going a manifest erosion, and here osteoclasts can be made out,together with a well-marked small-celled infiltration or new growthin the neighbourhood. Fie. Woodcut from a Photograph by R. A. tlWRS, from preparations by P. S. Abraham. In certain of the sections which have hit off the apical opening of theroot (Fig i), a plug of tissue continuous with the periodonteum is seenentering towards the pulp cavity, and this plug contains vessels no doubtfor the supply of the pulp. In both longitudinal and transverse sectionsof the pulp-cavity in several cases the tissue within shows evidence of life—nucleated cells of various shapes, and blood-vessels. I have not, how-ever, yet been able to trace the connection of the last with the vesselsin the in-growing plug of tissue or at the apex. These appearances THE DENTAL RECORD. 303 are particularly noticeable in those specimens of removed teeth whichhad a healthy aspect. In one tooth—that of N. W.—which hadbecome discoloured after replantation, disintegration of the pulp isfar advanced, and innumerable bacilli are present, resembling verymuch in size the common bacteria of de
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