^o THE DEPOSITS OF THE SEA-BOTTOM. 



especially black, porous basalt, and gray, volcanic tufa; the rest quartz and a single piece 

 of feldspar. 



Station 78. Southwest of Iceland; Globigerinaclay; 0-47 per ct Almost exclusively consisting of sponge 

 spicules; the quantity of minerals very small; about half of the minerals volcanic, viz. black, 

 compact basalt, and black, porous basalt; the rest quartz. 



Station 8a Southwest of Iceland; Globigerina clay; o-oi per ct. Chiefly not volcanic, that is to say, 

 of 12 grains were 8 quartz, 1 biotite; 3 gray tufa (?). 



Station 81. Southwest of Iceland; Globigerina clay; the percentage undetermined, very small; only 

 two small grains, one quartz, the other black, porous basalt. 



Station 83. Southwest of Iceland; Globigerina clay; the percentage undetermined, but very large, 3 

 stones being found, larger than in any other specimen, weighing nearly 10 grams; they were 

 rounded, and coated with a red-brown crust. They consisted of: 1) fine-grained, dark gray 

 basalt with numerous pores and cavities, aud with small grains of feldspar; 2) a gray, very 

 fine-grained, rather loose rock, mostly consisting of quartz (most likely sandstone); 3) gray 

 granite or gneiss, with very different sizes of grains, consisting of gray quartz and ortho- 

 clase, as also biotite. 



Station 85. Southwest of Iceland; Transition clay; I2'26 per ct The grains partly rounded, coated 

 with a rather thick, red-brown crust, which very much impeded the examination. The larger 

 pieces, over 2 mm in diameter, were absolutely exclusively volcanic, viz. 50 pieces of a red- 

 brown, fine-grained rock, probably altered basalt; 28 pieces of black, compact or fine-grained 

 basalt, 7 of gray pumice, 6 of dark gray, porous basalt, 5 of black pumice, 5 of gray basalt, 

 4 of brown-gray vesicular glass or pumice, 3 of black, volcanic glass, palagouite, 1 of gray, 

 volcanic tufa. In the exceedingly numerous smaller particles the same ingredients were by 

 far the most prominent; besides was found of volcanic material: olivine and plagioclase; of 

 not volcanic material: a few grains of quartz; a single table of muscovite. 



Station 89. Between Iceland and Greenland, nearer to Iceland; Transition clay; the percentage un- 

 determined, rather large. Far the greater part volcanic material ; chiefly gray grains, probably 

 tufa; further black, vesicular glass; colourless, vesicular glass, black and red-brown basalt; 

 a smaller quantity of gray pumice and plagioclase. Of not volcanic material was only 

 found a small quantity of quartz. 



Station 90. Between Iceland and Greenland; a little nearer to Iceland; Globigerina clay; 675 per ct. 

 The larger ingredients half-rounded, almost exclusively volcanic, out of 55 grains was only 

 one of quartz, and one of orthoclase; of the other 53 pieces 15 were compact or fine-grained, 

 black basalt, n a red-brown , fine-grained rock, probably disintegrated basalt, 9 black-gray, 

 porous basalt, 5 gray pumice, 5 black glass or palagonite, 3 brown-gray, vesicular glass, 2 

 gray, fine-grained basalt, 2 gray tufa, and 1 black, vesicular glass. Among the smaller pieces 

 (under 2 mm ) the same ingredients were found, chiefly in the same ratio; a little more quartz 

 was however found; further was found clear, colourless, volcanic glass, more or less vesicular, 

 a few grains of olivine, and red garnet. 



Station 91. Between Iceland and Greenland, a little nearer to Greenland: Transition clay: 900 per ct. 



