THE DEPOSITS OF THE SEA-BOTTOM. , x 



The larger pieces rather angular, far the greater part of volcanic material, viz. 47 grains of 

 52, distributed in the following way: n grains of a red-brown, loose rock, probably disinte- 

 grated basalt, 9 of black, porous basalt, 8 of gray pumice, 7 of vesicular, black glass, 5 of 

 black, compact basalt, 3 of black glass or palagouite, 2 of plagioclase, 1 of gray, compact 

 basalt, one crystal of augite. The five pieces of not volcanic material were: 3 pieces of 

 crystalline schist, gneiss, mica-schist, and quartzite, 2 grains of quartz. Among the innumerable 

 smaller grains the quartz was present in a comparatively somewhat larger quantity, other- 

 wise the ingredients were found in about the same ratio of quantity; further was found 

 colourless glass, olivine and biotite. 



Station 92. Between Iceland and Greenland, nearer to the latter; Transition clay; 2739 per ct In 

 this specimen that is situated not very far from the preceding one, the not volcanic material 

 is suddenly found to be predominant, so that among the grains over 2 mm , besides 6 that 

 could not be determined, 121 out of 141 were not volcanic. These ingredients were: 67 

 grains of fine-grained granite or gneiss, 35 of sandstone, 10 grains of quartz, 3 of a halle- 

 flinte-like rock, 2 of orthoclase, 2 of black, and one of gray clay-slate, one of black siliceous 

 slate. The volcanic ingredients consisted of 10 grains of black, porous basalt, 5 of red- 

 brown, fine-grained, disintegrated basalt, 2 of colourless feldspar, probably plagioclase, 2 of 

 gray tufa, and one grain of gray pumice. Among the smaller grains the same ingredients 

 were found in about the same ratio, quartz, however, in a larger quantity, as also gray tufa; 

 further were found olivine, colourless, volcanic glass, red garnet, augite, epidote, magnetite, 

 biotite. 



Station 94. Close to the east coast of Greenland; unnamed, as the specimen was taken up in an almost 

 washed out condition, so that all the finer ingredients were wanting. On the same account 

 the percentage is not determined, but is not especially large. Completely made up of very 

 small grains, far the greater part quartz, besides a single black clay-slate; of volcanic material 

 black, compact basalt, black vesicular basalt, colourless volcanic glass. 



Station 98. Near the west coast of Iceland. Unnamed on the same account as the preceding one, 

 and the percentage not determined, not especially large. Completely made up of very small 

 grains, almost exclusively of volcanic origin; the greater part was colourless, vesicular glass; 

 besides some compact, gray grains, possibly tufa, some pieces of black vesicular glass. Of 

 not volcanic material a few grains of quartz were found. 



Station 101. Northeast of Iceland; Gray deep-sea clay; 0-04 per ct Very small grains, chiefly of vol- 

 canic origin, viz. colourless, vesicular glass, black, vesicular glass, and black, compact or fine- 

 grained basalt. Further were found some grains of quartz. 



Station 102. Northeast of Iceland; Transition clay; 0-03 per ct Of 9 grains 8 were volcanic, viz. 

 black, vesicular glass, and black, compact basalt; one grain of quartz. 



Station 104. Northeast of Iceland; Globigerina clay; 0-13 per ct Almost half of the material volcanic, 

 viz. black, compact basalt, black, vesicular glass, one single grain of olivine ; the rest mostly 

 grains of quartz; a single grain of feldspar. 



Station 105. East of Iceland; Globigerina clay; ri8 per ct. Far the greater part not volcanic, viz 



