1050 
THE VOYAGE OF H.M.S. CHALLENGER. 
Analysis of the Residue of a Globigerina Ooze. 
By Dr. Klement. 
Station 338 ; 1990 fathoms, South Atlantic. 
A large quantity of Globigerina ooze was treated with dilute hydrochloric acid, taking 
care not to exceed a feeble acid reaction ; after elimination of the carbonates, the sulphates 
and the phosphates, the residue was analysed and gave the following results : — 
I. 0‘8360 grm. of substance dried at 110° C., fused with carbonates of soda and 
potash, gave 0‘4219 grm. of silica, 0'1506 grm. of alumina, 0‘1066 grm. of ferric 
oxide, 0'0220 grm. of manganese binoxide (Mn0 2 ), 0'0148 grm. of lime, and 0‘0567 
grm. of magnesium pyrophosphate. 
II. 1’1293 grms. of substance dried at 110° C., gave 0'1235 grm. of loss on ignition, 
treated with hydrofluoric and sulphuric acids gave 0‘0123 grm. of potash and 0 - 0135 
grm. of soda. 
Silica (Si0 2 ), . . . . . . . .50-47 
Alumina (A1 2 0 3 ), . . . . . . . . .18-01 
Ferric oxide (Fe 2 0 3 ), . . . . . . .12-75 
Lime (CaO), . .* . . . . . L71 
Magnesia (MgO), . . . . . . . .2-44 
Potash. (K 2 0), . . . . . . . . .1T1 
Soda (Na 2 0), . . . . . . . . .1-05 
Loss on ignition, . . . . . . . . 10-93 
101-47 
Analysis of Radiolarian Ooze. 
By Dr. Sipocz. 
Station 266 ; 2750 fathoms, Mid Pacific. 
I. (P6580 grm. of substance dried at 110° C., gave 0'1087 grm. loss on ignition, 
treated with hydrofluoric and sulphuric acids gave 0‘3478 grm. of silica, O'OOll grm. of 
cupric oxide, 0'0391 grm. of ferric oxide, 0'0529 grm. of alumina, 0'0263 grm. of phos- 
phoric acid, 0 - 01 15 grm. of manganous oxide (MnO), 0 - 0435 grm. of lime, 0'0318 grm. 
of magnesia, and traces of cobalt, potash, and soda. 
Silica (Si0 2 ), 
Copper oxide (CuO), 
Ferric oxide (Fe 2 0 3 ), 
Alumina (A1 2 0 3 ), . 
Manganous oxide (MnO), . 
Lime (CaO), 
Magnesia (MgO), . 
Loss on ignition, . 
Cobalt oxide, potash, soda, 
52-85 
0-16 
5-94 
8-22 
6-61 
4-84 
16-52 
traces 
100-87 
