EEPORT ON THE DEEP-SEA DEPOSITS. 
447 
Silica, . . . . . . . . . . 60'47 
Alumina, . . . . . . . . . . IS’Ol 
Peroxide of iron, ......... 12'75 
Manganese dioxide, . . . . . . . . . 3’00 
Lime, . . . . . . . . . . 1'71 
Magnesia, .......... 2‘44 
Potash, . . . . . . . . . .I'll 
Soda, . . . . . . . . . 1'05 
Water, . . . . . . . . . . 10'93 
101-47 
Note. — Before the blo'w-pipe this substance melted into a grey-green bead, like volcanic ash. 
59a. Globigerina Ooze (determination of soluble silica, alumina, and iron). — Station 338. 
Lat. 21° 15' S., long. 14° 2' W., 1990 fathoms (Element). 
On treating the ooze -with boiling hydrochloric acid a certain quantity of silica, alumina, iron, and manganese 
■was dissolved. After this operation there remained 2 -21 grms. of insoluble residue, and the quantity 
dissolved and re-precipitated by ammonia represented 0'0487 grm. of silica, 0‘0404 grm. of alumina, and 
0-0917 grm. of peroxide of iron. 
Silica, . . . . . . . . . .26-94 
Alumina, . . . . . . . . .22-34 
Peroxide of iron, . . . . . . . . .50-72 
100-00 
60. Pteeopod Ooze. — Station 22. 
Lat. 18° 40' N., long. 62° 56' W., 1420 fathoms (Brazier). 
Portion 
Portion 
soluble in Hydi-ochloric 
Acid=92-75 
insoluble in Hydrochloric 
Acid = 3 -45 
Loss on ignition after drying at 230° 
f Alumina, -j 
Ferric oxide, J ' 
Fahr., 
3- 80 
4- 42 
1 Calcium phosphate. 
2-41 
Calcium sulphate, . 
0-41 
Calcium carbonate. 
80-69 
Magnesium carbonate. 
0-68 
-Silica, . . . . 
4-14 
f Principally alumina and ferric 
oxide, with 1. 
3-45 
\ silica. 
J 
100-00 
Note. — W hen treated -with dilute hydrochloric acid this substance evolved a perceptible tarry odour. 
61. Pteeopod Ooze. — Station 23. 
Lat. 18° 24' N., long. 62° 56' W., 450 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid = 93 -95 
Portion insoluble in Hydrochloric 
Acid =2 -05 
Loss on ignition after drying at 230° Fahr., . 4-00 
'Alumina, . . . . • .1-80 
Ferric oxide, . . . . .3-00 
Calcium phosphate, . . . good trace 
■ Calcium sulphate, . . . • .1-00 
Calcium carbonate, . . . .84-27 
Magnesium carbonate, . . ■ . • 1 "28 
, Silica, . . . • ■ .2-60 
Principally alumina and ferric oxide, with ) ^.Qg 
silica, ' 
100-00 
Note, — When treated with dilute hydrochloric acid this substance evolved a perceptible tarry odour. 
