316 



THE ATLANTIC. 



[chap. v. 



Loss on ignition after drying at 230° F 5'0'2 



f Alumina 3"23 



Ferric oxide 4'18 



Portion soluble in [ Calcium phosphate Trace 



hydrochloric i'.cid ■{ Calcium sulphate 0"69 



= 82-90. 



Portion insoluble 

 in hydrochloric 

 acid = 12-08. 



Calcium carbonate 64-55 



Magnesium carbonate 1-17 



Silica 9-08 



Alumina l-'79 



Ferric oxide 0-60 



Lime 0.33 



Magnesia 0-28 



Silica 9-08 



100-00 



A globigerina ooze of a gray color, containing many pelagic forani- 

 inifera of the genera Globigerina, Pulvinulina, Orbulina, Pullenia, 

 and Sphceroidina ; a few BilocuUnoe and arenaceous foraminifera ; a 

 few shells of pteropods, otolites of fishes, and spines of echini ; a few 



.spicules of sponges and radiolarians. Amorphous clayey matter, and 



many small particles of quartz, mica, magnetite, feldspar, and augite. 

 The larger mineral particles were rounded as if wind-blown. 



No. 3.— Station V. February 21st. Lat. 24° 20' N. ; Long. 24° 28' 

 W. Depth, 2740 fathoms. Bottom temperature, 2°-0 C Chemical 

 composition : 



Loss on ignition after drying at 230° F 8-20 



r Alumina 4-70 



Ferric oxide 3-50 



Portion soluble in Calcium phosphate Traces 



hydrochloric acid -{ Calcium sulphate 0-70 



= 77-30. Calcium carbonate 56-39 



Magnesium carbonate 0-98 



Silica 11-03 



Alumina I'SO 



Ferric oxide 0-80 



Lime 0-50 



Magnesia 0-40 



t Silica 1 1 -OU 



100-00 



A red clay, containing many pelagic foraminifera of the genera Glo- 



higerina, OrhuUna, Sphceroidina, Fullenia, and Pulvinulina ; a few 



Biloculince and arenaceous foraminifera; a few radiolaria, and one or 



two pteropod shells. Much amorphous clayey matter, deeply dyed 



Portion insoluble 

 in hydrochloric 

 acid = 14-50. 



