APPENDIX III 
CHEMICAL ANALYSES. 
The following analyses have been made during the Examination of the Challenger Deep-Sea 
Deposits by different analysts, and have been nearly all referred to in the body of the work. 
The name of the analyst is affixed to each analysis immediately after the locality. 
1. Red Clay (after the finer parts had been washed away). — Station 5. 
Lat. 24° 20' N., long. 24° 28' W., 2740 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid=77’30 
} 
Portion insoluble in Hydrochloric 
Acid = 14 '50 
} 
Loss on ignition after drying at 230° Fahr. , . 8 '20 
'Alumina, . . . . . .470 
Ferric oxide, . . . . , 3'50 
Calcium phosphate, .... trace 
= Calcium sulphate, . . . . .070 
Calcium carbonate, . . . . 56'39 
Magnesium carbonate, . . . . 0'98 
1-Silica, . . . . . .11-03 
f Alumina, . . . . . .1-80 
j Ferric oxide, . . . . . 0’80 
= • Lime, ...... 0'50 
Magnesia, . . . . - . . 0'40 
.Silica, . . . . . .11-00 
100-00 
2. Red Clay (after the finer parts had been washed away). — Station 5. 
Lat. 24° 20' N., long. 24° 28' W., 2740 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid = 82-84 
} 
Portion insoluble in Hydrochloric 
Acid = 14 -56 
Loss on ignition after drying at 230° Fahr., 
2-60 
Alumina, ..... 
2-15 
Ferric oxide, .... 
4-76 
Calcium phosphate. 
2-09 
Manganese oxide, .... 
Calcium sulphate, .... 
0-29 
Calcium carbonate. 
. 60-29 
Magnesium carbonate, 
0-72 
Silica, ..... 
. 12-54 
Alumina, ..... 
3-13 
Ferric oxide, .... 
0-84 
Lime, ..... 
0-68 
Magnesia, ..... 
0-11 
.Silica, ..... 
9-80 
100-00 
(deep-sea deposits chall. exp. — 1891.) 
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