III. On the structure and development of vascular dentine

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Abstract
The minute structure and the development of that variety of dentine which is met with in most mammalian teeth, and which goes by the name of hard or unvascular dentine, have been repeatedly and very carefully worked out, and our knowledge of their intimate nature is quite on a par with our knowledge of that of the tissues of other parts of the body. But the intimate structure of those interesting and, from a morphological point of view, important varieties of dentine, known as vaso-dentine and osteo-dentine, is but very imperfectly known; in point of fact, whilst the arrangement of the tubes and channels which permeate their substance has been satisfactorily described by many observers, so far as it can be studied in sections of dried teeth, next to nothing is with any certainty known as to the contents of these channels, nor as to the manner in which they were formed. In this paper I propose to give the results of a series of observations upon the development of vascular dentine, and the relation which it, in its completed condition, bears to the dental pulp; and I hope to be able to place the nomenclature and classification of the varieties of dentine upon a more satisfactory basis, by bringing them into accordance with the facts elicited by a study of development, which at present they are not.

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