436 
THE VOYAGE OF H.M.S. CHALLENGER. 
29. 
R.\dioi.arian Ooze. — Station 274. 
Portion soluble in 
Acid -79-48 
Hydrochloric 
}■ 
Portion insoluble in Hydrochloric 
Acid = 13-11 
}- 
Lat. 7° 25' S., long. 152° 16' W., 2750 fathoms (Brazie 
Loss on ignition after drying at 230° 
Fahr., . 7-41 
^ Alumina, .... 
8-32 
Ferric oxide. 
. 14-24 
Calcium phosphate. 
1-39 
Manganese oxide, . 
3-23 
1 Calcium sulphate, . 
0-41 
Calcium carbonate, . 
3-89 
Magnesium carbonate, 
1-50 
L Silica, .... 
. 46-50 
r Alumina, .... 
2-20 
Ferric oxide, 
0-75 
Lime, .... 
0-39 
Magnesia, .... 
0-25 
Silica, .... 
9-52 
100 00 
30. Radiolarian Ooze. — Station 266. Lat. 11° 7' N., long. 152° 3' W., 2750 fathoms (Renard). 
I. 0 6580 grm. of substance gave 0-1087 grm. of loss on ignition, 0-3478 grm. of silica, 0-0011 grm. of cupric 
oxide, 0-0391 grm. of peroxide of iron, 0-0384 grm. of alumina, 0-0345 grm. of phosphate of 
alumina = 0-0145 grm. of alumina and 0 0200 grm. of phosphoric acid, 0 0099 grm. of pyrophosphate 
of magnesia, 0 0063 grm. of phosphoric acid, 0-0141 grm. of manganous sulphide = 0-0115 grm. of 
manganous oxide, 0 0435 grm. of lime, and 0'0884 grm. of pyrophosphate of magnesia = 0-0318 grm. of 
magnesia, and traces of cobalt, soda, and potash. 
II. 0 4725 grm. of substance heated with 2 grms. of carbonate of soda in the water-bath for thirty hours, 
water being constantly added, gave 0-0607 grm. of silica= 12-84 per cent. 
Silica, . . . . • • . . . .52-85 
Copper, . . . . . • . . . .0-16 
Peroxide of iron, . . . . . . . . .5-94 
Alumina, . . ■ . . . . .8-22 
Phosphoric acid, . . . . . . . . .3-99 
Manganous oxide, . . . . . . . .1-74 
Lime, .......... 6-61 
Magnesia, . . . . . ' . . . . . 4-84 
Cobalt, soda, potash, ........ traces 
Loss on ignition, . . . . . . . .16-52 
100-87 
31. Diatom Ooze. — Station 157. Lat. 53° 65' S., long. 108° 35' E., 1950 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid — 89-98 
Portion insoluble in Hydrochloric 
Acid — 4-72 
Lo.ss on ignition after drying at 230° Fahr., . 5-30 
Alumina, . . . .0-55 
Ferric oxide, . . . . .0-39 
Calcium phos))hate, . . . .0-41 
Manganese oxide, 
I Calcium sul])hate, . . . . .0-29 
I Calcium carbonate, . . . . .19-29 
I Magnesium carbonate, . . . .1-13 
t Silica, . . . . . .67-92 
Consisting of alumina and ferric oxide, with silica, 4-72 
100-00 
