NARRATIVE OP THE CRUISE. 
1045 
Summary of Quantitative Determinations . 
P. 
Total water (H 2 0),* 
24-90 
Total carbonic acid (C0 2 ), 
0-38 
Total phosphoric acid (P 2 0 5 
) extractable by hydrochloric acid, 
0-07 
(a) In Acetic Acid Extract. 
Lime (CaO), 
0-45 
Magnesia (MgO), 
0-36 
Soda (Na 2 0), 
0-60 
(b) In Hydrochloric Acid Extract from Acetic Acid Residue. 
Silica (Si0 2 ), 
Oxide of lead (PbO), 
0-01 \ 
7-47 
Oxide of copper (CuO), 
0-272 1 
0-93 
Oxide of cobalt (CoO), 
0-25 [ ' 
Oxide of nickel (NiO), 
Manganous oxide (MnO), 
0-40 j 
. 19-39 
Loose oxygen (0), . 
3-95 
Lime (CaO), 
1-33 
Magnesia (MgO), 
1-42 
Alkalies (R 2 0), 
0-34 
Alumina (A1 2 0 3 ), 
3-03 
Ferric oxide (Fe 2 0 3 ), 
16-20 
(c) In Sulphuric Acid Extract from Hydrochloric Acid Residue. 
Alumina and ferric oxide, 
1-62 
Silica (SiOg), 
(d) Ultimate Residue. 
0-83 
Silicates and silica, . 
. 14-91 
98-18 
Special Experiments on the State of Oxidation of the Manganese. 
The loose oxygen reported above had been determined in two ways, viz., firstly by 
Bunsen’s method : distilling with hydrochloric acid, and titrating the iodine equivalent of 
the chlorine liberated by means of thiosulphate — chemically pure iodine serving as a 
standard ; and secondly, by Fresenius and Will’s method : digestion of the substance with 
dilute sulphuric and oxalic acids, collecting the carbonic acid liberated in a tared potash 
bulb and soda-lime tube, and determining the increase of weight shown by the absorp- 
tion apparatus. In the latter case the carbonic acid of the carbonates was determined in 
* Determined directly, by expulsion in a combustion tube and collecting in chloride of calcium. 
