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But independently of the fact that ivory in permeated by tubes so fine that at their origin from the pulpy cavity they do not exceed 1/15000th part of an inch in diameter, OWEN had the tusk and pulp of the great elephant which died at the Zoological Gardens in London in 1847 longitudinally divided, and found that, "although the pulp could be easily detached from the inner surface of the cavity, it was not without a certain resistance; and when the edges of the co-adapted pulp and tusk were examined by a strong lens, the filamentary processes from the outer surface of the former could be seen stretching, as they were drawn from the dentinal tubes, before they broke.
Upon the whole history of the evolution of each tooth, in the growth of the dental follicle and its walls, the fruition of the dentinal germ, the making of the enamel organ, the dental pulp, the cementum and the peridental membrane, the endocrines leave their mark. There are certain general statements about the teeth and the internal secretions that can be made.
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