70 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 
clase, augite, olivine (?), voleanic glass, a little magnetite, a few manganese 
grains, and one or two flakes of hematite. 
Fine Washings (24.75 per cent), very flocculent brown clay, with 
numerous but extremely minute mineral particles. 
No. 50. Station 4531,* 6th February, 1905. 
Lat. 21° 4.5’ 8.; long. 133° 1.2’ W.; depth, 2225 fathoms. 
CALCAREOUS MUD: light brown, slightly coherent, powdery, containing 
no macroscopic elements. 
CALCIUM CARBONATE: 72.72 per cent, many very minute coccoliths and 
Tunicate spicules, together with a large quantity of calcium carbonate, prob- 
ably of organic origin, but so finely comminuted that no structure can be 
recognized under the microscope. 
REsiDvuE: 27.28 per cent : — 
Siliceous Organisms, 0 per cent. 
Minerals (0.1 per cent), principally manganese grains somewhat under 
0.1 mm. in diameter; most of the other particles are microscopic, a few at- 
taining a diameter of 0.1 mm.; the only one that can be specifically deter- 
mined is phillipsite, in the form of clusters; one or two particles appear to 
be volcanic glass. - 
Fine Washings (27.18 per cent), brown clay, darker in hue than the 
deposit itself, colored by the oxides of iron and manganese; no siliceous 
organisms can be seen, and the very rare mineral particles present are much 
too small to be determined. 
No. 51. Station 4532,* 7th February, 1905. 
Lat. 18° 29.4’ S.; long. 130° 50.8’ W.; depth, 2319 fathoms. 
RED CLAY: very dark brown, nearly black, very plastic and sticky, soft 
and clayey to the touch, 
CaLciuM CARBONATE: 18 per cent, pelagic and bottom-living Foramini- 
fera, and Fishes’ teeth. 
REsIpuE: 82 per cent : — 
Siliceous Organisms (small traces), only a few fragmentary arenaceous 
Foraminifera and Sponge spicules. 
Minerals (small traces), principally manganese grains, 0.1 mm. in di- 
ameter, a few angular splinters of colorless glass, and phillipsite in isolated 
crystals and twins. 
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