472 
THE VOYAGE OF H.M.S. CHALLENGER. 
Tlio following two analyses were made by Giimbel and Church from specimens obtained from members of 
the Expedition. Church does not mention the station from which his specimens came, but in all probability 
they came from Station 252 (J. M.). 
106a. Manganese Nodules. — Station 252. Lat. 37° 52' N., long. 160° 17' W., 2740 fathoms (C. W. Giimbel, 
Sitzinuisb. d. bayer. Akad. d. IFtss., 1878, ii. pp 189-209; also Neues Jahrb.f. Min. ^c., 1878, p. 869). 
Oxide of iron, ......... 27 ’460 
Peroxide of manganese, ........ 23 ’600 
Water 17-819 
Silica, .......... 16-030 
Alumina, . . . . * . . . . . 10-210 
Soda, .......... 2-358 
Chlorine, .......... 0-941 
Lime, .......... 0-920 
Titanic acid, ......... 0-660 
Sulphuric acid, ......... 0-484 
Potash, .......... 0-396 
Magnesia, .......... 0-181 
Carbonic acid, ......... 0-047 
Phosphoric acid, ......... 0-023 
Oxide of copper, ......... 0-023 
Oxides of nickel and cobalt, ....... 0-012 
Barium, .......... 0-009 
Doubtful traces of lead, antimony, boron, lithium, and iodine, . 
Traces of organic substances, ... 
101-173 
106b. Manganese Nodules. — Station 252. Lat, 37° 52' N., long. 160° 17' W., 2740 fathoms (A. H. Church, 
Mineralogical Magazine, vol. i. pp. 50-53, 1876). 
Water lost in vacuo, .... 
Water retained at 100° C., but evolved at a red heat, 
Manganese dioxide, .... 
Ferric dioxide, ..... 
Alumina, ...... 
Silica, ...... 
Chlorine, ...... 
Mg, Ca, Cu, Na, Cl, P.^Oj, &c., . 
100-00 
24-55 
10-00 
30-22 
20-02 
3-30 
10-37 
0-71 
0-83 
107. Manganese Nodule. — Station 253. 
Portion soluble in Hydrochloric 
Acid -73-20 
}- 
Portion insoluble in Hydrochloric 
Acid- 14-70 
)- 
Lat. 38° 9' N., long. 156° 25' W., 
3125 fathoms (Brazier). 
Loss on ignition after drying at 230° Fahr., 
. 12-10 
Copper, 
good trace 
Alumina, .... 
4-70 
Ferric oxide, 
. 21 -20 
Calcium phosphate. 
0-45 
Manganese oxide, . 
. 26-21 
Nickel, .... 
good trace 
Cobalt, .... 
. trace 
Calcium sulphate, . 
0-76 
Calcium carbonate, 
3-06 
Magnesium carbonate, 
0-86 
Silica, .... 
. 15-97 
Alumina, .... 
1-80 
Ferric oxide. 
0-90 
Lime, .... 
0-52 
Magnesia, .... 
0-32 
Silica, .... 
. 11-16 
100-00 
