THE VOYAGE OF H.M.S. CHALLENGER. 
4 < 4 
110. Manganese Nodules. — Station 274. 
Lat. V 25' S., long. 152° 15' W., 2750 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid = 82-60 
Loss on ignition after drying at 230° 
Fahr. , 
12-60 
Copper, .... 
0-79 
Alumina, .... 
1-00 
Ferric oxide. 
8-41 
Calcium phosphate, 
1-35 
Manganese oxide, . 
51-46 
Nickel, .... 
good trace 
Cobalt, .... 
Calcium sulphate, . 
0-59 
Calcium carbonate. 
3-58 
Magnesium carbonate. 
4-92 
Silica, .... 
10-50 
Alumina, .... 
0-60 
Ferric oxide. 
0-60 
Lime, .... 
0-45 
Magnesia, .... 
0-15 
Silica, .... 
3-00 
100-00 
Portion insoluble in Hydrochloric \ 
Acid = 4 '80 / 
Note. — Portions of two nodules sawn through, so as to obtain a fair average. 
111. Manganese Nodudes (external portions). — Station 274. 
Lat. 7° 25' S., long. 152° 15' W., 2750 fathoms (Brazier). 
Portion 
soluble 
Acid 
in Hydrochloric 
= 82-90 
Portion insoluble in Hydrochloric 
Acid -4 -60 
Loss on ignition after drying at 230° Fahr., 
. 12-50 
Copper, 
0-79 
Alumina, 
0-30 
Ferric oxide. 
. 11-97 
Calcium phosphate. 
0-83 
Manganese oxide, 
. 52-39 
Nickel, 
good trace 
Cobalt, 
Calcium sulphate, . 
0-75 
Calcium carbonate, . 
3-95 
Magnesium carbonate, 
2-12 
Silica, 
9-80 
Alumina, 
0-56 
Ferric oxide. 
0-94 
Lime, 
0-34 
Magnesia, . 
. 
0-11 
Silica, 
, 
2-65 
100-00 
