Mastodon Teeth and Tusks. 411 
immersed in dilute muriatic acid, which left a mass of very 
elastic cartilage, larger than the piece of ivory subjected to its 
action. The cartilage was of a yellowish-white color, and 
presented delicate filaments of membrane hanging to its sur- 
face. The appearance of the cartilage was like that obtained 
from the ivory of the tusks, but was more firm. 
The following analyses were made in my laboratory by Mr. 
Joseph Peabody. 
Analysis of the sound Ivory of Mastodon tooth. 
Water, .. : ; . f 8.64 
Animal Matter, — . i i 9 23.28 
Phosphate of Lime, . . j 56.198 
Carbonate of Lime, —. , . 9.844 
Magnesia, . i ` ; i 0.99. 
Soda and Fluorine, by loss,  . . 0.588 
100.000 
Analisis of the internal portion of same tooth, the decom- 
posed Ivory. 
Water, . í ; š . 4.84 
Animal Matter, . ‘ ; : 6.84 
Phosphate of Lime, i i 73.476 
Carbonate of Lime, . . . . 9.604 — 
Magnesia, i : i i 0.96 
Soda and Fluorine, by loss, . i. 4289 
100.000 
From the above researches, it is evident that the term ivory, 
9f the teeth, is appropriate, not only on account of its physical 
resemblance to the ivory of the tusks, but also from its simi- 
arity in chemical composition to true ivory. The mastodon 
th has no cement like that of the teeth of elephants. We 
have yet to analyze the enamel of the mastodon tooth, and 
shall communicate the results of our researches hereafter. 
