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: 0 per cent. 
ResipvE: 100 per cent : — 
Siliceous Orgasms, 0 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 (Rotalide), and one or two small Echinoid spines. 
ResipuE: 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. 
Fine Washings (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’ 8.; 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. 
