2 6 THE DEPOSITS OF THE SEA-BOTTOM. 



most correct to treat each of the sizes of grains separately, and the more, as they, on account of 

 the different circumstances in which they are found and their partly different origin, give results that 

 are not in ever}' respect identical. 



I. The Ingredients over o-5 mm . 



Station 2. Between Iceland and the Faroe Islands; Gray deep-sea clay; the percentage undetermined. 

 Chiefly numerous angular pieces of one and the same light gray rock; probably volcanic 

 tufa with grains of feldspar and small black grains; further 5 small rounded pieces of black 

 or dark brown basalt; 2 small rounded grains of quartz. 



Station 3. Between Iceland and the Faroe Islands; Gray deep-sea clay; 18-08 per ct. The grains all 

 rather rounded; more than half of their number black or dark gray basalt, compact or fine- 

 grained; of volcanic ingredients were found small quantities as: light gray tufa?, black glass, 

 pumice, a single grain of olivine; of not volcanic ingredients: a rock consisting of quartz, 

 feldspar, muscovite, and garnet (probably gneiss); another rock with quartz, feldspar, and 

 biotite (gneiss or granite); further a few grains of quartz, orthoclase, and a pyroxene mineral. 



Station 4. Between Iceland and the Faroe Islands; Gray deep-sea clay; I4 - I9 per ct. The pieces 

 rather much rounded, chiefly basalt as in the preceding specimen; besides were found of 

 volcanic ingredients: light gray tufa?, a single grain of olivine; of other ingredients pieces 

 of gneiss or granite, a single piece of granulite or quartz-porphyry, a single piece of gray 

 mica-schist, further grains of quartz and feldspar. . 



Station 6. The southeast coast of Iceland; Sand; the percentage undetermined. Almost exclusively 

 rounded pieces of differently coloured basaltic rocks; a few pieces of light gray tufa, a few 

 grains of quartz. 



Station 7. The southeast coast of Iceland; Brown deep-sea clay; 0-95 per ct. By far the larger part 

 basalt; a little rounded or almost quite angular pieces of black basalt, partly coated with a 

 red-brown crust made by disintegration; the structure sometimes more glassy and vesicular. 

 Further were found some pieces of light pumice and gray tufa; one single piece of slate. 



Station 8. The southwest coast of Iceland; Transition clay; o - io per ct. A couple of larger and 

 several smaller pieces of the same rock, a black pumice, vesicular and glassy. 



Station 9. Between Iceland and Greenland; Brown deep-sea clay; the percentage undetermined. Half- 

 rounded pieces of basalt, sometimes passing into pumice; a few other grains could not be 

 referred to any particular rock. 



Station 10. Between Iceland and Greenland; Globigerina clay; 3-82 per ct. Chiefly almost angular 

 pieces of pumice, black or gray; besides also pieces of brown or gray tufa, black, compact 

 basalt; one single colourless grain of feldspar. 



Station 11. Between Iceland and Greenland; Globigerina clay ; the percentage undetermined, very large. 

 One single, especially large piece (io mm ) consisted of reddish white zeolites, forming the stuff- 

 ing of a cavity with dark brown crust Another rather large piece consisted of a soft greenish 

 gray rock; further were found several, only little marked pieces of basalt, pumice, and tufa. 



