448 
THE VOYAGE OF H.M.S. CHALLENGER. 
62. Pteropod Ooze (after the finer parts had been washed away). — Station 24. 
Lat. 18° 38' 30" N., long. 65° 5' 30" W., 390 fathoms (Brazier). 
Portion 
soluble in Hydrochloric 
Acid — 94‘10 
} = 
Portion insoluble in Hydrochloric 
Acid ■= 3 '90 
} 
Loss on ignition after drying at 230° Fahr. , 
2-00 
Alumina, ..... 
0-80 
Fen-ic oxide, .... 
3-06 
Calcium phosphate. 
2-44 
Manganese oxide, .... 
Calcium sulphate, .... 
0-73 
Calcium carbonate. 
82-66 
Magnesium carbonate. 
0-76 
Silica, ..... 
3-65 
Consisting of alumina and ferric oxide, with silica. 
3-90 
100-00 
63. Blue Mud. — Station 213. 
Lat. 5° 47' N., long. 124° 1' E., 2050 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid = 42 '24 
Portion insoluble in Hydrochloric 
Acid = 52 -84 
Loss on ignition after drying at 230° Fahr. , 
4 '92 
Alumina, 
7-75 
Ferric oxide. 
7-50 
Calcium phosphate. 
trace 
Manganese oxide. 
good trace 
Calcium sulphate, . 
0-58 
Calcium carbonate. 
1-75 
Magnesium carbonate. 
1-14 
Silica, 
23-52 
Alumina, 
7-33 
Ferric oxide. 
3-73 
Lime, 
1-63 
Magnesia, 
0-31 
Silica, 
. 39-84 
100-00 
64. Blue Mud. — Station 323. 
Lat. 35° 39' S., long. 50° 47' W., 1900 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid -44 -82 
Portion insoluble in Hydrochloric 
Acid — 40 '58 
Loss on ignition after drying at 230° Fahr. , 
f Alumina, . . . . . 
Ferric oxide, . . . . 
Calcium phosphate, 
. Manganese oxide, . . . . 
Calcium sulphate, , . . . 
Calcium carbonate, . . . . 
Magnesium carbonate, 
'-Silica, . . . . . 
'Alumina, . . . . . 
Ferric oxide, . . . . 
• Lime, . . . . . 
Magnesia, . . . . . 
. Silica, . . . . . 
5-60 
5-50 
5-61 
139 
0-42 
2-94 
0-76 
28-20 
8-05 
2-77 
2-51 
0-26 
36-00 
100-00 
