REPORT ON THE DEEP-SEA DEPOSITS. 
455 
II. 0’520 grm. of substance dried at 110° C., treated with hydrofluoric and sulphuric acids, required for the 
determination of protoxide of iron 6‘5 c.c. of permanganate of potash = 0 0395 grm. of protoxide of iron 
(1 c.c. of permanganate of potash = 0'005846 grm. of protoxide of iron). 
III. 1'0252 grms. of substance dried at 110° C. gave 0'0127 grm. of potash and, by difference, 0'0288 grm. 
of soda. 
Silica, .......... 60-56 
Titanic acid, . . . . . . . 0'80 
Alumina, . . . . . . . 10'30 
Peroxide of iron, . . . . . . . 4'95 
Protoxide of iron, . . . . . . . . . 7'59 
Protoxide of manganese, . . . . . .0-14 
Lime, . . . . . . . . .9-35 
Magnesia, . . . . . . . . . . 9'27 
Potash, . . . . . . . . . . 1-24 
Soda, . . . . . . . . .2-81 
Water, . . . . . . . . . .1-70 
98-71 
80. Pumice. — Station 241. 
Lat. 35° 41' N., long. 157° 42' E., 2300 fathoms (Renard). 
I. 1-2725 grms. of substance dried at 110° C., fused with the carbonates of soda and potash, gave 0-7755 
grm. of silica, 0-2032 grm. of alumina, 0-1155 grm. of peroxide of iron, 0-0371 grm. of lime, 0-0629 
grm. of loss on ignition, 0-0493 grm. of pyrophosphate of magnesia = 0-0178 grm. of magnesia. 
II. 1-0515 grms. of substance dried at 110° C., treated with hydrofluoric and sulphuric acids, gave 0-0707 
grm. of the chlorides of soda and potash, 0-0914 grm. of chloroplatinate of potash = 0-0169 grm. of potash 
and, by difference, 0-0246 grm. of soda. 
Silica, 
Alumina, 
Peroxide of iron. 
Lime, 
Magnesia, 
Potash, 
Soda, 
Loss on ignition. 
Manganese, 
99-22 
15-97 
9-08 
2-92 
1- 40 
1-61 
2- 34 
4-95 
lai-£re trace 
81. Basic Volcanic Glass. — Station 285. 
Lat. 32° 36' S., long. 137° 43' W., 2375 fathoms (Renard). 
I. 0-8463 grm. of substance, fused with the carbonates of soda and potash, gave 0-4510 grm. of silica, 0-1258 
grm. of alumina, 0-0991 grm. of ferric oxide, 0-0788 grm. of lime, 0-1834 grm. of pyrophosphate of 
magnesia = 0-06619 grm. of magnesia. 
II. 0-5448 grm. of substance, treated with hydrofluoric and sulphuric acids, required for oxidation 6-6 c.c. 
permanganate of potash solution (I c.c. permanganate of potash solution = 0-0058463 grm. of ferrous 
oxide) = 0-03859 grm. of ferrous oxide. 
III. 1-5701 grms. of substance gave 0-0265 grm. of water (loss on ignition). 
IV. 1-5235 grms. of substance, treated with hydrofluoric and sulphuric acids, gave 0-08159 grm. of the 
chlorides of potash and soda, 0-0243 grm. of cldoroplatinate of potash, corresponding to 0-0074 grm of 
chloride of potash = 0-0047 grm. of potash, and 0-0741 grm. of chloride of soda = 0-0392 grm. of soda. 
