THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 67 



ent as one would expect from its behavior in the moist state, the dry lumps 

 crumbling easily between the fingers. An interesting point about this de- 

 posit is the remarkable facility with which it is attacked by cold dilute 

 hydrochloric acid, which dissolves completely the oxides of iron, alumina, 

 and manganese, and leaves a residue of silica. It is reported that the 

 sounding-tube struck on a manganese nodule. 

 Calcium carbonate : per cent. 

 Residue : 100 per cent : — 



Siliceous Organisms, per cent. 



Minerals (traces) ; the very few mineral particles present could not be 

 separated from the flocculent clay on account of their small size ; they are 

 angular, with a mean diameter of about 0.02 mm. ; augite is the only 

 species recognized, and that not with certainty ; minute manganese grains 

 are distributed throughout the mass. 



Fine Washings (100 per cent), flocculent clayey matter, with a few 

 minute mineral particles. 



No. 44. Station 4721, 15th January, 1905. 

 Lat. 8° 7.5' S. ; long. 104° 10.5' W. ; depth, 2084 fathoms. 

 GLOBIGERINA OOZE : light brown, granular, with little plasticity when 

 wet; practically incoherent when dried. 



Calcium carbonate : 75 per cent, pelagic Foraminifera, with a very 

 few bottom-living forms (Rotalidae), and one or two small Echinoid spines. 

 Residue : 25 per cent : — 



Siliceous Organisms (about 0.1 per cent), Radiolaria, arenaceous Fora- 

 minifera, Sponge spicules, and Diatoms; in the coarser portion of the 

 residue, siliceous organisms are much more abundant than mineral particles. 

 Minerals (traces), a few angular particles, 0.1 mm. in mean diameter, 

 including magnetite, augite, and a reddish product of decomposition. 



FineWashings (24.90 per cent), brown flocculent clay, with a good many 

 fragments of siliceous organisms, but remarkably free from mineral particles, 

 except minute manganese grains. 



No. 45. Station 4726, 18th January, 1905. 



Lat. 12° 30.1' S. ; long. 111° 42.2' W. ; depth, 1700 fathoms. 



GLOBIGERINA OOZE: dull brown, granular, very earthy, containing 



many conspicuous Foraminifera ; neither plastic nor sticky ; incoherent 



when dried. 



