NARRATIVE OF THE CRUISE. 
1051 
Analysis of Diatomaceo us Ooze. 
By Dr. Sipocz. 
Station 157 ; 1950 fathoms, Southern Ocean. 
I. 0 - 5618 grm. of substance dried at 120° C. gave 0 - 0330 grm. loss on ignition, 
treated with hydrofluoric and sulphuric acids gave CP5092 grm. of silica, 0'00112 grm. of 
barium oxide, 0’00085 grm. of potash and (P00225 grm. soda. 
II. 0'6487 grm. of substance dried at 120° C. gave 0‘0379 grm. loss on ignition, 
treated with hydrofluoric and sulphuric acids gave 0'5870 grm. of silica, 0'0013 grm. of 
barium oxide, O’OO 57 grm. of ferric oxide, 0'0085 grm. of alumina, 0'0022 grm. of lime, 
(P00198 grm. of magnesia, and traces of phosphoric acid. 
I. II. Mean. 
90-63 90-49 90-56 
088 0-88 
1-31 1-31 
0-33 0-33 
0-20 ... . 0-20 
0-30 0-30 
0-15 ... 0-15 
0-40 ... 0-40 
trace . . . trace 
5-87 5'84 5-85 
99-98 
For analysis of glauconitic grains and casts see p. 468 ; and of Globigerina ooze see 
p. 915. 
Silica (Si0 2 ), . 
Ferric oxide (Fe 2 0 3 ), 
Alumina (A1 2 0 3 ), 
Lime (CaO), 
Baryta (BaO), . 
Magnesia (MgO), 
Potash (K 2 0), . 
Soda (Na 2 0), . 
Phosphoric acid (P 2 0 3 ), 
Water (H 2 0), . 
Loss on ignition, 
134 
(nark, chalk, exp.-—' vol. i. — 1885.) 
