REPORT ON THE DEEP-SEA DEPOSITS. 
453 
75. Manganese Nodules (nuclei of bone). — Station 286. 
Portion soluble in Hydrochloric \ ^ 
Acid=91-09 ) 
Portion insoluble in Hydrochloric ' 
Acid = 4 '21 
j. 133° 22' W., 2335 fathoms (Brazier). 
Loss on ignition after drying at 230° Fahr. , 
4-70 
f Copper, ..... 
trace 
Alumina, ..... 
2-30 
Ferric oxide, .... 
. 13-88 
Calcium phosphate, 
, 53-12 
Manganese oxide, .... 
3-62 
Nickel, .... 
trace 
Cobalt, ..... 
trace 
Calcium sulphate, .... 
2-62 
Calcium carbonate, .... 
11-56 
Magnesium carbonate. 
0-75 
^Silica, ..... 
3-24 
r Alumina, 
0-50 
Ferric oxide, .... 
1-70 
Lime, ..... 
0-51 
Magnesia, ..... 
0-15 
.Silica, . • . 
1-35 
100-00 
Note. — Two nodules, harder than the rest, coated with a light brown shell, which easily peeled off, and after being removed 
was reserved. 
76. Pumice. — Station 226. 
Lat. 14° 44' N., long. 142° 13' E., 2300 fathoms (Brazier). 
Portion 
soluble in Hydrochloric 
Acid = 74 -59 
Portion insoluble in Hydrochloric 
Acid = 16-51 
Loss on ignition after drying at 230° Fahr. , 
8-90 
f Copper, 
small trace 
Alumina, 
7-00 
Ferric oxide. 
. 26-28 
Calcium phosphate. 
good trace 
Manganese oxide, . 
. 10-25 
Nickel, 
small trace 
Cobalt, 
Calcium sulphate. 
0-29 
Calcium carbonate, . 
1-29 
Magnesium carbonate, 
0-68 
t Silica, 
. 28-80 
f Alumina, 
2-74 
1 Ferric oxide. 
1-36 
-{ Lime, 
1-01 
1 Magnesia, . 
. 0-40 
1 Silica, 
. 11-00 
100-00 
Note. — M aterial like pumice, light in weight, with reddish particles on surface. 
