REPORT ON THE DEEP-SEA DEPOSITS. 
273 
The insoluble residue consisted apparently 
hydrochloric acid seemed to be a mixture of — 
of amorphous silica. 
The part soluble 
Phosphate of lime, 
60 0 per cent, of the whole substance. 
Carbonate of lime. 
9-4 
>3 
Fluoride of calcium. 
1-4 
>) 
Binoxide of manganese, , 
1-6 
Ferric oxide, .... 
and minor constituents. 
4-8 
if 
A portion of a flat whalers bone, much impregnated with manganese, was submitted 
to analysis. A small portion in the centre, comparatively uncoloured by the manganese, 
was used for the following determinations : — 
Moisture, .... 
2-87 per cent. 
Phosphoric acid, .... 
29-13 „ 
Fluorine, ..... 
1-44 „ 
Lime, ...... 
36-05 „ 
Substances insoluble in hydrochloric acid. 
2-91 „ 
There was an appreciable quantity of manganese present, and also a trace of cobalt. The 
outer manganiferous portion was completely analysed, with the following results ; — 
Portion insoluble in hydrochloric acid, . 
Total water, .... 
Manganous oxide. 
Loose oxygen, .... 
Ferric oxide, .... 
Alumina, 
Lime, ..... 
Magnesia, .... 
Potash, ..... 
Soda, . . . . . . 
Phosphoric acid, 
Carbonic acid. 
Traces of copper, chlorine, fluorine, and loss. 
5- 76 
9-77 
20-22 
3-49 
6- 54 
1-66 
19-71 
7- 42 
0- 55 
1 - 12 
18-59 = 40-90 per cent, tricalcic phosphate. 
3-87 
1-30 
100-00 
The manganese is probably present mostly as hydrated binoxide, and partly as pro- 
toxides. 
Another portion of a flat whale’s bone, in which the manganese was pretty well 
diffused throughout, was used for the following determinations : — 
Moisture, 
Combined water. 
Phosphoric acid. 
Fluorine, 
(deep SEA DEPOSITS CHALL. EXP. — 1891 .) 
5 - 49 per cent. 
6 - 88 
13-05 
0-65 
35 
