58 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 



Calcium carbonate: 11.12 per cent, pelagic Foraminifera of small size 

 and generally broken. 



Residue : 88.88 per cent : — 



Siliceous Organisms (traces), a few Sponge spicules and arenaceous 

 Foraminifera. 



Minerals (traces) ; most of the mineral particles pass off with the 

 " fine washings," those of appreciable size (exceeding 0.05 mm. in diameter) 

 being very few in number, and consisting of plagioclase, augite, and man- 

 ganese grains. 



Fine Washings (88.88 per cent), chocolate-brown flocculent clay, with 

 a few very minute mineral particles too small (0.005 mm. in diameter) to 

 be determined. 



No. 29. Station 4699, 25th December, 1904. 

 Lat. 21° 39.5' S. ; long. 104° 29.8' W. ; depth, 2168 fathoms. 



GLOBIGERINA OOZE: plastic and sticky, smooth to the touch; the 

 sample is partly dark brown, partly light yellowish-brown ; dries into hard 

 lumps ; might be called Red Clay. 



Calcium carbonate : 33.02 per cent, pelagic Foraminifera, mostly 

 broken, with a few small transparent bottom-living Foraminifera. 

 Residue : 66.98 per cent : — 



Siliceous Organisms (traces), one or two Sponge spicules. Radiolaria 

 and arenaceous Foraminifera are mentioned in the preliminary report, but 

 were not observed in the sample examined. 



Minerals (traces) ; the few minerals of appreciable size have a mean 

 diameter of 0.3 mm., and are angular, but most of the particles are too small 

 to be determined ; the larger and more abundant particles are palagonite, 

 while plagioclase (not identified) and magnetite are also present; the most 

 characteristic mineral is phillipsite, of which there are a few, very small, iso- 

 lated crystals ; manganese oxide is diffused in particles of microscopic size ; 

 there are also a few flakes of some greenish chloritic mineral. 



Fine Washings (66.98 per cent), chocolate-brown flocculent clay, with 

 a few minute mineral particles. 



No. 30. Station 4701, 26th December, 1904. 

 Lat. 19° 11.5' S. ; long. 102° 24' W. ; depth, 2265 fathoms. 



RED CLAY : dark chocolate-brown, plastic and sticky, forming when dried 

 hard lumps that give a shining brown streak. 



