REPORT ON THE DEEP-SEA DEPOSITS. 
495 
153c. Brain Case of Globiocephalus, European Seas (Dittmar). 
P. 
P. 
E. 
Phosphoric acid, .... 
22-45 
0-94851 
Carbonic acid, ..... 
3-18 
0-1446 1 
Chlorine 0-085 = (Cl2-0) or muriatic acid. 
0-066 
0-0024 j" 
Sulphuric acid, .... 
0-21 
0-0053 J 
Fluorine, ..... 
0-004 
Lime, ...... 
30-04 
1 -07271 
Magnesia, ..... 
0-38 
0-0190 1 
Potash, ..... 
trace 
1 
Soda, ...... 
1-62 
0-0523 J 
Phosphates of iron and alumina. 
1-25 
Moisture, .... 
8-93 
Organic matter, .... 
31-79 
99-92 
-1-1440 
The fluorine was determined in 8 grms. of the ash of the substance, and found to amount to 0‘57 mgrms., 
that is to 0'007 per cent, of the ash, or 0‘004 per cent, of the original substance. 
From these analyses it would appear that the percentage of fluorine in recent marine bones is very 
minute. For the sake of comparison I determined the fluorine in a sample of ordinary bone ash, and found it 
0'004 per cent., 7.e., almost nil. As it is stated that teeth contain more fluorine than ordinary bones, I pro- 
cured a quantity of horses’ teeth, ignited them, and determined the fluorine in the ash. It was found equal 
to 0'084 per cent., which, though decidedly higher than the number obtained with the bones, is still very 
minute. I have no doubt that the I or 2 per cent, of fluoride of calcium, which we And reported in the older 
analyses of bones, is based on utterly erroneous determinations. This, however, only confirms what Nickl^s 
gave some years ago as the result of an extensive investigation on the subject, 
For the number of equivalents of carbonate present per equivalent of phosphate, we have in : — 
No. 153 a. No. 153b. No. 153c. 
0-162 0-197 0-153 
1 1 
6-2 5-1 6-6 
or. 
Ratio of equivalents- 
(3P2O6) 
1 
(CO2) 
0-239 
In recent Zifhius bone (153b.) they were- 
1 : 
101-36 
(Fs) 
0-055 
153d. Portion of Ziphius Beak from Red Crag, Suffolk (Dittmar). 
A thin plate cut out of the beak, highly polished on one side; it was wholly petrified and homogeneous, 
and was completely soluble in hydrochloric acid. 
Moisture, 
Combined water, 
Phosphoric acid. 
Carbonic acid, . 
Fluorine l-50 = (F 2 -O), 
Sulphuric acid. 
Chlorine and silica, 
Lime, . 
Magnesia, 
Ferric oxide. 
Alumina, 
Potash, 
Soda, 
P. 
P. 
E. 
1-67 
2-31 
0-2566' 
33-83 
1-4294 
7-50 
0-3409 
0-87 
0-0789 1 
0-62 
O-OI 55 J 
nil. 
48-81 
1-7431 
1-08 
0-0540 
2-00 
0-0577 
0-18 
O-OIO 5 I 
0-52 
0-0111 1 
1-97 
0-0635 J 
0-197 
nil. 
