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Ch. 6 Sources of Ivory

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QUALITIES OF IVORY              227
contains from 40 to 43 per cent, of organic matter, while human dentine has only about 25 per cent.*
The following analyses of dentine are published in Tomes's "Manual of Dental Anatomy." I is by Von Bibra of per­fectly dried dentine, II is another by Von Bibra, and III is by Berzeliusrf
In fossil ivory a much larger proportion of fluoride of lime appears than in that taken from animals of our day. This is believed by Monsieur Carnot to be due to metamorphosis, the fluorine having replaced to a certain extent the lime phosphate.
The density of ivory varies in specimens from different places; the specific gravity as given in Landholt's Tabellen^ is from 1.83 to 1.92; the Annuaire of the French Bureau des Longitudes** gives a slightly higher figure—namely, 1.93.
*Tomes, op. cit., p. 373.
fTomes, Charles S., "A Manual of Dental Anatomy," 3d ed., London, 1889, p. 63.
ILandholt's physikalisch-chemische Tabellen, Berlin, 1894, p. 67.
**Annuaire pour l'an 1906, Publiée par le Bureau des Longitudes, Paris, 1906, p. 439,
Ch. 6 Sources of Ivory Page of 681 Ch. 6 Sources of Ivory
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