REPORT ON THE DEEP-SEA DEPOSITS. 
445 
Water, . . . . . . . . . . 6'02 
Silica, . . . . . . . . 31-66 
Alumina, . . . . . . . . . . 9 '21 
Peroxide of iron, .... .... 4‘52 
Lime, . . . . . . . . . . 25‘68 
Magnesia, . . . . . . . . . .2-07 
Soda, . . . . . . . . . 1’63 
Potash, . . . . . . . . . .1-33 
Sulphuric anhydride, . . . . . 0‘27 
Carbonic acid, ......... 17‘13 
Chlorine, . . . . . . . . 2'46 
101-98 
On subtracting the oxygen corresponding to the chlorine, . . .0-87 
There remain ...... 101 -11 
55. Red Mud (determination of soluble salts retained in the sediment). — Station 120. 
Lat. 8° 37' S., long. 34° 28' W., 675 fathoms (Horiiung). 
The substance -was washed with warm and cold distilled water till the water no longer gave the reaction of 
chlorine. It was afterwards pulverised and treated with hydrofluoric and sulphuric acids. 
1-4088 grms. of substance dried at 100° C. gave 0-0496 grm. of the chlorides of soda and potash, 
and 0-1013 grm. of chloroplatinate of potash = 0-0195 grm. of potash and 0-0099 grm. of soda : — 
Potash (KjO), ........ 1 -38 per cent. 
Soda (Na20), . . . . . . . 0-70 ,, 
56. Globigerina Ooze. — Station 176. 
Lat. 18° 30' S., long. 173° 52' E., 1450 fathoms (Renard). 
I. 1 0463 grms. of substance dried at 110° C., fused with the carbonates of soda and potash, gave 0-1852 
grm. of silica, 0-0508 grm. of alumina, 0-0711 grm. of peroxide of iron, 0-0176 grm. of peroxide of 
manganese, 0-3670 grm. of lime, 0-0474 grm. of pyrophosphate of magnesia = 0-0171 grm. of 
magnesia. 
II. 1-9834 grms. of substance dried at 110° C., treated with hydrofluoric and sulphuric acids, gave 0-0328 grm. 
of the chlorides of soda and potash, 0-0347 grm. of chloroplatinate of potash = 0-0065 grm. of potash 
and, by difference, 0-0129 grm. of soda. 
III. 0-9571 grm. of substance dried at 110° C. served for the determination of carbonic acid = 0-2785 grm. 
IV. 1-2462 grms. of substance dried at 110° C. served for the determination of water. 
Silica, .......... 17-71 
Alumina, . . . . . . . . .4-86 
Peroxide ofpron, . . . . . . . .6-80 
Peroxide of manganese, . . . . . .1-69 
Lime, . . . , . . . . .35-08 
Magnesia, . . . . . . . . . .1-64 
Potash, . . . . . . . . .0-32 
Soda, . . . . . . . .0-65 
Carbonic acid, . . . .29-10 
Water, . . . . . . .2-95 
Copper, nickel, cobalt, and phosphoric acid, ..... traces 
100-80 
