CHAP, v.] 



GENERAL CONCLUSIONS. 



315 



APPENDIX A. 



The General Hesidts of the Cheinical and Microscopical Examiyiation of 

 a Series of Twenty Samples of the Bottom^ from the Observing Sta- 

 tions on the Section hetiveen Teneriffe and Sombrero. 



(The samples were analyzed by Mr. James S. Brazier, Regius Pro- 

 fessor of Chemistry in the University of Aberdeen. The microscopic 

 work was done by Mr. John Murray, and the results are taken from 

 his notes.) 



No. 1. — Station I. February 15th, 1873. Lat. 27° 24' N., Long. 

 16° 55' W. Depth, 1890 fathoms. Bottom temperature, 2°-0 C. 

 Chemical composition : 



Loss on ignition after drying at 230° F 7-91 



' Alumina 5'2tj 



Ferric oxide 3'95 



Portion soluble in Calcium phosphate Large traces 



hydrochloric acid -{ Calcium sulphate 0'44 



— 73'07. Calcium carbonate 500(> 



Magnesium carbonate 1'32 



_ Silica 1210 



f Alumina }_ ^.^^ 



Portion insoluble 



in hydrochloric 



acid - 19 02. 



Ferric oxide 



Lime 1-26 



Magnesia 0-52 



L Silica 13-77 



100-0(» 



A globigerina ooze, containing many coccoliths and rhabdoliths, many 

 pelagic foraminifera of the genera Globigerina, Fulvimdina, Orbulina, 



Fullenia, etc. Amorphous clayey and calcareous matter, and small 



particles of feldspar, mica, quartz, hornblende, and magnetite. 



No. 2.— Station II. February l7th. Lat. 25° 52' N., Long. 19° 14' 

 W. Depth, 1945 fathoms. Bottom temperature, 2°'0 C. Chemical 

 composition : 



