1395.] Fluorine as a Test for the Fossilization of Animal Bones. 315 
matter has been reported. - The relative proportions between 
the fluorine and phosphoric acid will be set forth further on 
in these tests or assays and are classed according to their geo- 
logic deposits. 
It is deemed proper to cite other tables made by other chem- 
ists and reported from standard works. This for the purpose 
of comparison : 
Fossil Bones after Girardin and Preisser, reported in the 
Annales de Physique et de Chimie, 1843, Vol. 3, p. 370. 
| z Pai 
§ Pret ee reo 
G f = 80 E Erg | 
RE E A S Be N Foote ee E 4 
>] z rA e © o T =} 
a a 2 z Ba Errr a = 
S 2 = 2 3 = | 2 7 E 
etait eialei2iss < 
o oe f] 3 oe o 
= © a A a» © | = 
P| | k 
~ | 
| 
Metacarpal o “of Fossil | | | | } | 
News Cavern of Mialet, | | | | | j | 
PEER EAO A O S Turia 1.80 | 7.17. | 75.45 | BBE eic] TEAS TOORN ia nT 100 
2. f Fossil Ele- | } | | | 
phan “Alluvial deposit at | | | } | 
Baiat ' Pierre sur Dives. | | i | | | 
(Calvados. ) n.se ss ssssssrs retas Riki traces | 75.91 | 3.15 |........ 198.40 ELR aias 100 
3. t jos | | | | 
saurus erred | | | | 
p Oxfordian food T | | | 
Maps me eet ides 2.20 | 4.80 | 54.20} 4.61) 6 40| 10.17) 2.11 | 9.21 | 6.30 100 
"E rge bone of the Poe- | | | 
kilopleuron bucklandii | | 
quarries of Maladrerie,cal- | 
Asa Ju ae "E URRAS PASARE EN FTIA poai 0.12 | 25.31 | 0.86 | 1.29 i.n. 100 
j. Jchthyosaurus-——. 
bone fo the Dives rg pate Weve 1.34 | 46.00 | 1.00 | 16.11 | 31.09} 1.02} 3.21 ).......2./} 100 
5; ‘ pacaesenbne 
bone, from the chalk chlo- 
n pee Scull, 8.19 | 76.00} 1.08! 0.70} 10.00; 0.12; 3.01%......... 100 
C. OSAUT HUS 
from the urasi, EENE 0.60 | 7.07 | 70.11 | 1.45 aa 17.12 | 1.65] 2.00 |2........ 100 
3. Bone 0: na! : 
aa] ear Val- À 
ogani | 76.40 meisit Oti | O08 |) + S421 TOOT 200 
Sone agg gira ao, 
Straits of Magellan, S 5 ETA A LIT POLIS) O86 ioi 14.48 po RS Ras eee At 100 
It is to be noted that the last number given for the fluoride 
of calcium shows that the exactitude of these analyses are not 
always to be es phone 
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