432 
THE VOYAGE OF H.M.S. CHALLENGER. 
No. 1, Found in 100 parts. 
Undecom posable silicates, .... 
7 '66 In combining weight. 
Water, ....... 
12-31 
HjO X 1-3680 
Carbonic acid, ...... 
12-62 
COj X 0-6690 
Phosphoric acid, ...... 
3-19 
PjO„ X 0 0449 
Silica, ....... 
25-60 
SiOa X 0-8533 
Alumina, ....... 
8-43 
AI2O3 X 0-1640 
Ferric oxide, ...... 
5-40 
Fe203 X 0-0675 
Manganous oxide, ...... 
1-29 
MnO X 0-0363 
Lime, ....... 
9-93 
CaO X 0-3546 
Magnesia, ....... 
6-95 
MgO X 0-2975 
Potash, ....... 
2-60 
K2O X 0-0553 
Soda, ....... 
3-61 
98-48 
NajO X 0-1163 
umber of eqq. of phosphoric and carbonic acids = 0 '7037 
0516 eqq. 
; of lime 
and magnesia 
= 0-6521 ; excess 
Excess of acid eqq., .... 
. 0-0516 
Eqq. of ferric oxide, .... 
. 0-2025 
Excess of ferric oxide, .... 
e carried over to the silica as FejOj x 0‘0503. Doing so, 
we have in multiples of 
. 0-1509 
Si02 
R.JO3 
RO and R2O 
H3O 
0-8533 
0-2143 
0-2079 
1-368 ; or 
1 
0-2611 
0-2437 
1 -60 ; or 
4 
1-004 
1-025 
6-4 
This, if we leave the water on one side, is the formula of a metasilicate ; but, as the substance is decomposable 
by hydrochloric acid, it must be looked upon as a hydric ortho-silicate (a zeolite) of the formula 
(AlA. FojOs)'" ) 
RO y 4Si02 + 2Aq. , 
4H..0 ) 
mixed with the normal carbonates and phosphates of lime and magnesia, and some phosphate of ferric oxide. 
This, at least, appears to me the most plausible theory, although possibly the close agreement of the above 
co-efficients with the small integers of the formula may be purely accidental. 
21. CavsTALS OF PuiLLiPSiTE. — Station 276. Lat. 13° 28' S., long. 149° 30' W., 2350 fathoms (Dittmar). 
No. 2, Found in 100 parts. 
Undecomposablo silicates, 
Water, • 
Carbonic acid, 
Phosidioric acid, 
Silica, 
Alumina, 
Ferric oxide, 
.Man^canous oxide, . 
Lime, 
Magnesia, 
Potash,* 
.Soda,* 
8 ’04 (by difference). In combining weight. 
19-79 
H2O 
X 
1-8660 
6-17 
COo 
X 
0-1993 
0-65 
X 
0-0078 
35-38 
SiOj 
X 
1-0000 
16-04 
AI2O3 
X 
0-2481 
7-35 
Fe^Oa 
X 
0-0779 
0-47 
MnO 
X 
0-0112 
1-73 
CaO 
X 
0-0524 
2-35 
MgO 
X 
0-0997 
1-63 
KjO 
X 
0-0294 
2-40 
NQ20 
X 
0-0657 
100-00 
' W 10 of thi* water proved volatile at 100° C. 
* After the (uinmary determination of the alkalies os chlorides, the weight of the PtCl^Kj wa.s lost, 
calculated on the OMumfition of the ratio of potash and soda being the same os in No. 1. 
The numbers given are 
