42<3 
THE VOYAGE OF H.M.S. CHALLENGER. 
3. Red Clay. — Station 7 . 
Lat. 23“ 23' N., long. 31“ 31' W., 2760 fathoms (Brazier). 
Portion 
soluble in Hydrochloric 
Acid -52-98 
}- 
Portion insoluble in Hydrochloric 
Acid -39 -67 
}- 
Loss on ignition after drying at 230° Fahr., 
7-45 
Alumina, 
6-40 
Ferric oxide. 
. 15-42 
Calcium phosphate. 
. trace 
Calcium sulphate, . 
1-60 
Calcium carbonate. 
4-11 
Magnesium carbonate. 
1-20 
Silica, 
. 24-25 
Alumina, 
6-00 
Ferric oxide. 
2-54 
Lime, 
1-06 
Magnesia, 
0-64 
Silica, 
. 29-33 
100-00 
4. Red Clay. — Station 8. 
Lat. 23“ 12' N., long. 32“ 56' W., 2700 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid — 63-01 
} 
Portion insoluble in Hydrochloric 
Acid — 28-04 
} 
Loss on ignition after drying at 230“ Fahr. , . 8-95 
^Alumina, . . . . . .8-95 
Ferric oxide, . . . . .9-70 
Calcium phosphate, . . . large trace 
- Calcium sulphate, . . . . .2-24 
Calcium carbonate, . . . .16*42 
Magnesium carbonate, . . . . 2-70 
-Silica, . . . . . .23-00 
'Alumina, . . . . . .4-20 
Ferric oxide, . . . . .2-10 
■ Lime, ...... 0-89 
Magnesia, . . . . . .0-60 
t Silica, ...... 20-25 
100-00 
5. Red Clay. — Station 9. 
Portion soluble in Hydrochloric I 
Acid — 43 '74 / 
Portion insoluble in Hydrochloric 
Acid — 45 86 / 
. 35“ 16' W., 3150 fathoms (Brazier). 
Loss on ignition after drying at 230“ Fahr., 
. 10-40 
Alumina, 
8-30 
Ferric oxide. 
9-75 
Calcium phosphate. 
good trace 
Calcium sulphate. 
0-87 
Calcium carbonate, . 
3-11 
Magnesium carbonate. 
1-90 
Silica, 
. 19-81 
Alumina, 
9-10 
Ferric oxide. 
2-04 
Lime, 
0-47 
Magnesia, 
0-95 
Silica, 
. 33-30 
100-00 
