410 Jackson's Analysis of 
Analysis of the tusk of a Mastodon from Benton County, 
Missouri. Specimens furnished by Dr. J. C. Warren. 
On examination of this tusk it was found to have under- 
gone partial decomposition ; the interior had become white 
and earthy, while most of the exterior plate of ivory had un- 
dergone but little change. 
The white, earthy-looking matter in the middle of the tusk, 
on analysis, yielded 4.60 per cent. of water, 6.20 per cent. of 
animal matter, and 89.20 per cent. of bone salts. 
The exterior plate analyzed, yielded 
Water, : ‘ : 4.6 
Animal Matter, : i ; -— M. 
Bone Salts, . > s ý i 69.2 
100.0 
The hard ivory of the tusk yielded 
Water, . ; : : i 4.600 
Cartilage, conis iss i ; . 30.800 
Phosphoric acid, : ; ; 27.424 
Lime, . : i ` : . 36.024 
900 
Magnesia, ` : . : 
Fluorine, Carbonic acid, &c., by loss, — -252 
100.000 
I etched a piece of glass with the fluohydric acid obtained 
from the bone salts of this ivory. : 
A portion of the ivory digested in water acidulated with 
chlorohydric acid, gave a tough and elastic piece of cartilage 
of the size and shape of the piece of tusk subjected to s 
action. 
Analysis of Mastodon teeth from Benton County, Missouri. 
Specimens from my collection. 
A portion of the ivory of the root of one of these teeth was 
