CHAP, v.] GENERAL CONCLUSIONS. 319 



A red clay, containing mucli amorphous clayey matter, and many fine 



mineral particles — feldspar, mica, quartz, and magnetite. A few entire 



and many broken pelagic and arenaceous foraiiiinifera. 



No. 8. — Station XI. March 1st. Lat. 22° 45' N., Long. 40° 37' 

 W. Depth, 2575 fathoms. Bottom temperature, 2°'0 C Chemical 

 composition : 



Loss on ignition after drying at 230° F 9-13 



' Alumina 5'61 



Ferric oxide 4'65 



Portion soluble in Calcium phosphate 



hydrochloric acid ^ Calcium sulphate 1 -Oli 



76-59. 



Portion insoluble "| 



in hydrochloric }■ 



acid = 14-28. j 



Calcium carbonate 51-16 



Magnesium carbonate 1-98 



Silica 12-22 



Insoluble residue, principally alumina and ferric oxide, 



with silica 14-28 



100-00 



A red clay, containing much deep-red amorphous clayey matter, with 



many particles of feldspar, magnetite, augite, mica, quartz, etc.' A 



good many pelagic foraminifera and their fragments. Coccoliths and 

 rhabdoliths. 



No. 9. — Station XII. March 3d. Lat. 21° 57' N., Long. 43° 29' 

 W, Depth, 2025 fathoms. Bottom temperature, l°-9 C. Chemical 

 composition : 



Loss on ignition after drying at 230° F 8-80 



Alumina 1924 



Ferric oxide 1374 



Calcium phosphate Fair traces 



Calcium sulphate 1-37 



Calcium carbonate 43-93 



Magnesium carbonate 1-94 



General residue, consisting of soluble silica with the insoluble silicates 10-98 



100-00 



A globigerina ooze, containing many pelagic foraminifera of the gen- 

 era Globigerina, OrbuUna, Pulvinulina, Sphct')'oidina, and Pullenia ; 



many coccoliths and rhabdoliths. Much amorphous clayey matter, 



with iron and manganese peroxides. 



No. 10.— Station XIIL March 4th. Lat. 21° 38' N., Long. 44° 39' 



