1395.] Fluorine as a Test for the Fosstlization of Animal Bones. 443 
Average of the five specimens from Eocene: 
Phosphoric acid, ; : : ; 30.39 
Fluorine, . - : ; ‘ 1 
ws \ Ratio, 0.70. 
Fluorine calculated for spatiis, : 2.71 
Ash 
sigl g 
AESA E 
E] re 2 S S S 
Cretaceous. fee es si/s13 
Be Bf og eb Bag ym 
AE A Z 
ô E S 
fe 
urus camperi. A vertebra from the chalk 
+. — 
of Maes triont, Doan Porous, a grayish- Diiin be- 
porong o lightly green y calcination. Ca te of : 
lime in ee atte, teases of chlorine, no silica. oe 10.18 | 2.50 | 32.73 | 3.06 | 2.92); 1.05 
2. Large turtle from the same locality with the same 
characters. The on slightly more descr E Ee EEE EREA, 8.69 | 4:10 | 36.10 | 3.33 | 3.22 | 1.03 
3. Reptile dinosaur fro e su 
of Ariege. White, dense, becoming aoe ot gooenlals 
by calein n. Carbonate of lime in considerable quan- 
tity, traces of chlorine, no Es EOE RE AE 7.53 | 0.47 | 32.70 | 2.85 | 2.92) 0.98 
Belgium 
dense, fragile; gi aae a parer er of light gray, 
turning slightly yellow, but be.oming oe p pA with 
light green tint by ignition. Carbona in | 
rather Pao goni paiphate of lime rad nota jle quan- 
no p: , a little silica, traces of chlorine.............. 6.47 | 2.87 | 32.17; 2.62 | 2.87) 0.91 
dinosaur. Rib = ao hier ms stage 
of Filgate, Southern England. nish-gray, 
ee Aere by aki teng p ea of 
uantity, traces of chlorine, no 
s ae NNA DOR EEEO EE N A O E soeseene sevens 8.80 | 3.30 | 38.65) 2.76) 3.45] 0.80 
faa 
pan 
= 
®© 
ine, gg pores 2 lean ey sassesssevssvvcsoes| 9.20 | 3:18 | 86.82 | 2.69 | 3.18] 0.90 
+ 
Average of the six Cretaceous specimens : 
Phosphoric acid, ; : o 34.92 
Fluorine, . : ; 2.87 \ Ratio, 0.92. 
Fluorine oaii for ia oo 3.117 
