1048 
THE VOYAGE OF H.M.S. CH ALLEN GEE . 
A nalysis of a Manganese Nodule. 1 
By Professor A. Renard. 
Station 276 ; 2350 fathoms, South Pacific. 
I. 0*8271 grm. of substance dried at 100° gave 0'0787 grm. water (H 2 0), 0T600 
grm. silica (Si0 2 ), 0*0264 grm. of lime (CaO), 0'0526 grm. alumina (A1 2 0 3 ), 0*2208 
grm. peroxide of iron (Fe 2 0 3 ), 0*0148 grm. magnesia (MgO), 0*2354 grm. manganic 
oxide (Mn 2 0 3 ) corresponding to 0*2189 grm. of manganous oxide (MnO), 0*0119 grm. 
nickel (Ni) corresponding to 0*0151 grm. oxide of nickel. 
II. 0*1425 grm. of substance dried at 100° treated with hydrochloric, acid and the 
resulting gas conducted into a solution of potassium iodide liberated iodine; 12 c.c. of 
potassium thiosulphate (1 c.c. =0*937 c.c. of the standard solution) ; 1 c.c. of the standard 
Cl O 
solution = ^ or whence 1 c.c. = 3*55 grms. of chlorine or 0*8 grm. of oxygen — 
1000 : 0-8 = 12 x0-9377 : x. 
.-. 1000 : 0-8 = 11-24 : x. 
.*. x — 0*008992 grm. of oxygen capable of liberating chlorine from hydrochloric acid, 
i.e., 6*31 per cent, oxygen. 
The atomic ratio of 0*384 0 is required if Mn be present as Mn0 2 and Ni as Ni 2 0 3 , 
but 0*394 0 was the ratio observed — 
Manganous oxide, 
Nickel, 
Oxygen, 
a 
b 
a 
~b 
26-46 
MnO = 71 
0-372 
1-82 
Ni =74-8 
0-024 
6-31 
O =16 
0-394 
0-372+ ^ 
A 
= 0-384 
The formula Mn0 2 + -|H 2 0 requires 9*18 per cent, water. Consequently 26*46 per 
cent, manganous oxide, which corresponds to 32*42 per cent, manganese binoxide, is 
equivalent to 3*28 per cent, water. 
26*7 per cent, ferric oxide require as limonite 4*50 per cent, water. 
I. 
II. 
Water (H 2 0), .... 
9-51 
9-51 
Silica (Si0 2 ), .... 
19-34 
19-34 
Lime (CaO), .... 
3-19 
3-19 
Alumina (A1 2 0 3 ), 
6-36 
6-36 
Ferric oxide (Fe 2 0 3 ), 
. 26-70 
26-70 
Magnesia (MgO), 
179 
1-79 
Manganous oxide (MnO), 
. 26-46 
26-46 
Nickel oxide (NiO), 
1-82 
1-82 
Oxygen (0 2 ), i . . . 
6-31 
6-31 
101-48 
1 In the remainder of this Appendix the symbols are used with their ordinary value, H = 1 and 0 = 16. — J. M. 
