REPORT ON THE DEEP-SEA DEPOSITS. 
433 
Joint number of and CO^ 
,, ,, of (CaO and MgO)’s= .... 
Excess of acid Eqq. .... 
The ferric oxide = jFejOs X . . . . . 
Excess gFcjOgX .... 
Transferring this {i.e., 0'0544 x FegOg) to the silicate part, we have 
0-2227 
0-1521 
0-0706 
0-2337 
h-1631 
SiO^ 
R 0 O 3 RO 
H 2 O 
H 3 O 
R 3 O 
(red heat) 
100 ° 
X 1 
0-3025 0-1063 
1-008 
0-8576 
. . 
. 1-0138) 
X or 10 
3-025 1-063 
10-08 
8-6 
Here again we have a surprisingly close approximation to small integers, leading to the formula 
IRO ilOSiOg + SAq. 
lOHjO ) 
But unfortunately this formula does not agree with the one found for the silicate in No. 1. Erom the 
analyses it seems that No. 2 was prepared from No. 1 by treatment with dilute acid ; if so, then clearly, if one of . 
the two formulae represents a chemical species (or mixture of isomorphous species), the other certainly does not. 
22. Red Clay. — Station 281. Lat. 22° 21' S., long. 150° 17' W., 2385 fathoms (Brazier). 
Portion 
soluble in Hydrochloric 
Acid=74-47 
Portion insoluble in Hydrochloric 
Acid=17'83 
} 
Loss on ignition after drying at 230° Fahr., 
7-70 
f Alumina, 
8-80 
j Ferric oxide, 
. 24-60 
Calcium phosphate, 
small trace 
Manganese oxide. 
2-73 
Calcium sulphate, . 
trace 
Calcium carbonate, . 
2-50 
Magnesium carbonate. 
3-24 
. Silica, 
. 32-60 
' Alumina, 
1-60 
Ferric oxide. 
3-80 
Lime, 
0-84 
Magnesia, . 
0-32 
V Silica, 
. 11-27 
100-00 
23. Red Clay. — Station 285. Lat. 32° 36' S., long. 137° 43' W., 2375 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid -77 -03 
} 
Portion insoluble in Hydrochloric 
Acid = 13'97 
} 
Loss on ignition after drying at 230° Fahr., 
9-00 
f Copper, 
trace 
Alumina, 
7-50 
Ferric oxide. 
. 23-55 
Calcium phosphate. 
0-70 
Manganese oxide. 
. 14-53 
Calcium sulphate, . 
0-58 
Calcium carboiiate, . 
4-07 
Magnesium carbonate. 
1-13 
. Silica, 
. 24-97 
f Alumina, 
2-85 
Ferric oxide. 
1-05 
Lime, 
0-55 
Magnesia, . 
0-09 
^Silica, 
9-43 
100-00 
(deep-sea deposits chall. exp. — 1891.) 
57 
