REPORT ON THE DEEP-SEA DEPOSITS. 
463 
the HgO’s supplementing what would otherwise be a meta- into an ortho-silicate, which explains its 
decomposibility by hydrochloric acid. I am, however, very far from asserting that the substance really is such 
a zeolite. Before doing so I should wish to repeat my analysis with a larger supply of purified material. 
93. Basic Volcanic Glass. — Station 276. 
Lat. 13° 28' S., long. 149° 30' W., 2350 fathoms (Sipocz). 
A. Unaltered Nucleus (spec, grav., 2'90). 
I. 0-9040 grm. of substance, fused with the carbonates of soda and potash, gave 0-4227 grm. of silica, 0-1254 
grm. of peroxide of iron, 0-1601 grm. of alumina, 0 0043 grm. of manganoso-manganic oxide, 0-1045 
grm. of lime, and 0-2604 grm. of pyrophosphate of magnesia. 
II. 0-3390 grm. of substance, treated with hydrofluoric and sulphuric acids, required for oxidation 6-35 c.c. 
permanganate of potash (1 c.c. permanganate of potash = 0-0058296 grm. of protoxide of iron), corre- 
sponding to 0-037018 grm. of protoxide of iron, 
III. 0-8385 grm. of substance, treated with hydrofluoric and sulphuric acids, gave 0-0314 grm. of the chlorides 
of potash and soda, 0-0075 grm. of chloroplatinate of potash, corresponding to 0'0023 grm. of chloride 
of potash = 0-00144 grm. of potash, and 0-0291 grm. of chloride of soda = 0-01543 grm. of soda. 
Silica, .......... 46-76 
Peroxide of iron, . . . . . . . . .1-73 
Protoxide of iron, . . . . . . . . .10-92 
Alumina, , . . . . . . . . .17-71 
Manganous oxide, . . . . . . . . .0-44 
Lime, . . . . . . . . . .11-56 
Magnesia, . . . . . . . . . .10-37 
Potash, . . . . . . . . . .0-17 
Soda, .......... 1-83 
94. Palagonite. — Station 276. 
Lat. 13° 28' S., long. 149° 30' W., 2350 fathoms (Sipocz). 
101-49 
B. Decomposed Coating. 
I. 0-5681 grm. of substance, dried at 105° C., gave 0-0543 grm. of loss on ignition, then fused with the car- 
bonates of soda and potash gave 0-2541 grm. of silica, 0-0828 grm. of peroxide of iron, 0-0924 grm. of 
alumina, 0-0159 grm. of manganoso-manganic oxide, 0-0107 grm. of lime, and 0-0554 grm. of pyrophos- 
phate of magnesia = 0-01239 grm. of magnesia. 
II. 0-3801 grm. of substance, dried at 105° C., treated with hydrofluoric and sulphuric acids, gave 0-0565 grm. 
of the chlorides of potash and soda, 0-0794 grm. of chloroplatinate of potash, corresponding to 0-0242 
grm. of chloride of potash = 0-0153 grm. of potash, and 0-0323 grm. of chloride of soda = 0-017126 grm. 
of soda. 
Silica, 
Peroxide of iron. 
Alumina, 
Manganic oxide. 
Lime, 
Magnesia, 
Potash, 
Soda, 
Water, 
14-57 
16-26 
2-89 
1-88 
2-23 
4-02 
4-50 
9-56 
100-64 
