HEPOET ON THE DEEP-SEA DEPOSITS. 
431 
18. Eed Clay. — Station 275. 
Lat. 11° 20' S., long. 150° 30' W., 2610 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid = 66 ’10 
Portion insoluble in Hydrochloric 
Acid = 27 ’40 
Loss on ignition after drying at 230° Eabr. , 
6-50 
Alumina, ..... 
7-45 
Ferric oxide, .... 
. 15-71 
Calcium phosphate, 
0-76 
Manganese oxide, .... 
3-85 
Calcium sulphate, .... 
0-58 
Calcium carbonate. 
3-74 
Magnesium carbonate, 
1-96 
^Silica, ..... 
. 32-05 
f Alumina, . . . . c 
6-35 
1 Ferric oxide, .... 
2-35 
1 Lime, ..... 
0-44 
I Magnesia, ..... 
0-30 
L Silica, ..... 
. 17-96 
100-00 
19. Eed Clay (after the finer parts had been washed away). — Station 276. 
Lat. 13° 28' S., long. 149° 30' W., 2350 fathoms (Brazier). 
Portion soluble in Hydrochloric 
Acid = 80 -70 
Portion insoluble in Hydrochloric 
Acid = 17 '10 
} 
Loss on ignition after drying at 230° Fahr, , 
2-20 
Copper, 
trace 
Alumina, 
9-00 
Ferric oxide. 
9-03 
Calcium phosphate. 
3-44 
Manganese oxide, 
2-28 
Calcium sulphate, . 
0-58 
Calcium carbonate, . 
. 38-13 
Magnesium carbonate, 
0-94 
. Silica, 
. 17-30 
' Alumina, 
4-27 
Ferric oxide. 
1-07 
Lime, 
0-22 
Magnesia, . 
0-11 
. Silica, 
. 11-43 
20. Crystals of Phillipsite. — Station 27 6. 
100-00 
Lat. 13° 28' S., long. 149° 30' W., 2350 fathoms (Dittmar). 
There were two specimens, one marked “ No. 1,” the other “ No. 2.” 
According to a verbal communication from Mr. Murray, No. 1 contains Foraminifera, which were removed 
from part of the original specimen to produce No. 2. 
No. 2, when viewed under the microscope, was found to consist mainly of groups of yellowish crystals. In 
No. 1 these crystals were associated with a multitude of calcareous fragments. 
These two specimens were analysed in the same manner, but not, I am sorry to have to add, with the same 
degree of success. While fully convinced of the correctness of the numbers to be given for No. 1, those for 
No. 2, I fear, do not possess the degree of precision which I should wish them to have. 
In either case the substance was disintegrated by means of hot hydrochloric acid, and the insoluble part, after 
removal of the soluble silica by means of boiling carbonate of soda solution, ignited and weighed. 
The hydrochloric acid solution was exhaustively analysed, separate portions of substance serving for the 
determination of alkalies and water respectively. 
