Of the SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 653 



CaCO^:—m\. 



Siliceous organisms 55 per cent. : — Diatoms : Coscinodiscus, Navicula, Rhizo- 

 solenia, Eucampsia, Actinocyclus, Fragilaria, etc. 



Minerals 25 per cent., m. cli. O'll mm., largest 0"63 mm., rounded and angular: — 

 Brown and green volcanic glass, many of the pieces altered into reddish palagonite, 

 and with a dark coating of MnOg, magnetite, quartz, green fibrous hornblende, felspar, 

 biotite. 



Fine washings 20 per cent. : — Fragments of diatoms, small mineral particles, and 

 amorphous matter. 



5. Station 183; February 9, 1903; lat. 59° 42' S., long. 34° 13' W. ; depth 

 1325 fathoms. 



Diatom Ooze. — Only a very small amount scraped off the sounding - lead. 

 Certainly a washed specimen ; as examined, it was composed almost entirely of 

 fragments of diatoms and pieces of rust off the sounder. 



Diatoms: — Coscinodiscus, Fragilaria, etc. A few mineral particles, mostly under 

 0*05 mm. The only recognisable fragment a piece of pumice ; a few grannies with a 

 manganese coating. 



6. Station 198; February 12, 1903; lat. 59° 49' S., long. 31° 32' W. ; depth 

 663 fathoms. 



Hard Ground. — Merely a few grains of deposit adherent to the sounding-lead. 

 Fragments of diatoms, none recognisable. A few mineral particles, including quartz, 

 felspar, green and brown hornblende. Some amorphous matter. 



7. Station 215; February 15, 1903; lat. 61" 58' S., long. 26° 03' W. ; depth 

 2250 fathoms. 



Glacial Mud or Clay. — Only obtained in very small amount adhering to the 

 vaseline on the sounder. Greyish-green in colour when wet, dirty white when dry. 

 Microscopically it consists almost entirely of clayey matter, no definite mineral particles 

 being recognisable, although there are a few granules coated with manganese, and 

 some very small reddish fragments, possibly of palagonite. There are also a few 

 fragments of siliceous organisms. The deposit is almost certainly similar in character 

 to No. 8. 



8. Station 226; February 17, 1903; lat. 64° 18' S., long. 23° 09' W. ; depth 

 2739 fathoms. 



Glacial Clay. — Obtained in quantity from the Admiralty sounding-tube. Of a 

 greenish drab colour when wet, pale grey when dry. Upper layers loose and flocculent ; 

 lower, a tough clay. Soapy feeling when rubbed between the fingers, with a few gritty 



TRANS. ROY. SOC. EDIN., VOL. XLIX. PART III. (NO. 10). 87 



