20 F. V. Greene on the composition of remains of Mammalia. 
ish white. Assumes a greenish tint when heated in presence of 
air. Contains: 
Mg Ca OaFl Ba Na kK §i § — G WH Org. Mat. 
1-140 47-052 5-086 1131 1572 0-276 0-259 2-200 32-957 2-270 1-971 4-086=100-000 
with traces of chlorine, and oxyds of manganese and iron; which 
may be considered as 
3Mg0,PO, . : 2099 CaFl - . 3 5-086 
3CaO, PO; . 68°582 CaO ; i ; 6517 
2NaO, PO; . : 1-079 8CaO, SiO, . . 0732 
BaO, SO, un ee O pe pO 
NaO, SO, ‘: 2443 Org. Mat. é * 4086 
KO,S80, a ae 
CaO, COs . apn 100-000 
With very few exceptions the analyses which have heretofore 
been made, show in the inorganie part but a slight difference be- 
tween recent and fossil bones, which fact is sustained by the re- 
sults of the present analyses. In the above investigations, a 
portion than recent ones; but in no instance was so large a 
quantity found as in the analysis of fossil reptiles by Baumert,* 
where the fluorid of calcium in the Zeuglodon macrospondylus 
amounts to 9:54 per cent., and in the Hydrarechos to 16-67 
rcent. By direct determination, Heintzt found the fluorid 
of calcium in two human bones to be 2-97 and 2°05 per cent. ; 
the first of which corresponds exactly with the quantity found 
in the dentine of the Titanotherium. In the tibia of the Arche- 
otherium a portion of the fluorid of calcium may have been 
introduced in a manner similar to that of the quartz and sulphate 
of baryta. 
* Liebig und Kopp, Jahresbericht fiir 1851, p. 594, 
t Pogg. Ann. vol. lxxyii, p, 267, 
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