CHAP, v.] 



GEyEUA L CONCL USWNS. 



828 



W. Deptli, 3000 fathoms. Bottom temperature, 1°"3 C. Chemical 

 composition : 



Loss on ignition after drying at 230° F 7-44 



f Alumina 12-91 



I J'orric oxide 10-33 



Calcium phosphate Traces 



Calcium sulphate 0-96 



Calcium carbonate 1-49 



Magnesium carbonate 3-10 



t Silica 27-68 



Alumina 7'8 1 



Ferric oxide 1-57 



Lime 103 



Magnesia 0-52 



Silica 25-16 



Portion soluble in 



hydrochloric acid 



=^ 56-47. 



Portion insoluble 

 in hydroelilorie 

 acid - 36-09. 



100-00 



A red clay, containing amorphous clayey matter, with oxide of iron ; 



small crystals of sanidine, mica, augite. A few siliceous spicules. 



Only a single fragment of Globigerina shell was observed. 



No. 17.— Station XX. March I'ith. Lat. 18° 56' N., Long. 59° 35' 

 W. Depth, 2975 fathoms. Bottom temperature, 1°'6 C. Chemical 

 composition : 



Loss on ignition after washing and drying at 230° F 



Alumina 



Ferric oxide 



Portion soluble in Calcium phosphiite 



hydrochloric acid \ Calcium sulphate 



56-83. 



Portion insoluble 

 in hydrochloric 

 acid = 35-72. 



Calcium carbonate. . . . 

 Magnesium carbonate . 



Silica 



Alumina 



Ferric oxide . . 



Lime 



Magnesia 



Silica 



7-45 



12-28 



11-44 



.Small trace 



1-47 



3-50 



2-14 



26-00 



7-28 



2-36 



1-18 



0-50 



24-40 



100-00 



A red clay, containing amorphous clayey matter, with oxide of iron ; 



small particles of hornblende, augite, magnetite, sanidine, and quartz, 



and a few grains of peroxide of manganese. A few siliceous spicules. 



Only two fragments of Globigerina shell occurred in the portion of the 

 sample examined. 



