67 



Mation 23 i. 



N. B. 71" 6', V. L. 8° 38'. 259 Favne (474 Meter). 



1.0°. Graasort, tungt, lost sammenhængende Sandler. 



Flere Stene (veiende indtil <>.;! (Ir.), bestaaende af porøs 



basaltisk Lava og vulkanske Slakker med Olivin. Ingen 



Dyrelevninger. 



Si0 2 



48.13 



Det vulkanske Saudier bar en forboldsvis bøi Mag- 

 nesiagehalt, der vel nærmest maa skrive sig fra den til- 

 stedeværende Olivin. 



Stene paa Havbunden. 



De største Stene som fandtes i Bundprøverne bavde 

 en Vægt af 10 — 12 Gram. Størrelsen og Antallet af de i 

 en Prøve forekommende Stene stod. som man paa Forbaand 

 kunde vente, i et direkte Forbold til binanden. De Bund- 

 prøver. hvori de største Stene fandtes, indeboldt i Alminde- 

 ligbed ogsaa de fleste. Ved Betragtning af de Bundprøver, 

 der er optagne efter binanden i en Rækkefølge fra Land 

 og ud over mod Dybet, bar man Anledning til at iagttage, 

 bvorledes Stenene efterbaanden aftager i Størrelse og Antal. 

 I det følgende giver jeg en Fortegnelse over de Bundprøver, 

 i bvilke Stenene maa siges at udgjøre en væsentlig (ikke 

 tilfældig) Bestanddel. Alle disse Bundprøver er optagne 



1 Dette forholdsvis betydelige Tab er muligens fremkommet der- 

 ved, at jeg har undladt at bestemme Mangan, der i ovenstaaende 

 Prøve syntes at være tilstede i noget større Mængde end i de fore- 

 gaaende. 



Station 234. 



Lat. 71° 6' N., long. 8" 38' W.; d. 259 fatboms 

 (474 m.); b.-t. -1.0°. A greyish-black, heavy, friable, 

 sabulous clay. containing divers pebbles (the largest weigh- 

 ing 0.3" r ) of porous basaltic lava. and scoriæ with olivine. 



No animal remains. 



Loss by ignitiou . 2.28 

 Protoxide of iron . 3.77 

 Sesquioxide of iron 3.64 

 Alumina .... 7.51 



Lime 3.27 



Magnesia. . . . 3.17 

 Carbonic acid . Traces 

 Pbosphoric acid Traces 

 Silica fi.nT 



Decomposed 



by 



Hydrochloric acid 

 24.09 per cent. 



Undecomposed 



by 



Hydrochloric acid 



69.36 per cut. 



Sesquioxide ol iron 5.59 

 Alumina .... 15.63 

 Magnesia. . . . 5.06 

 Silica 43.08 



Constituents of sample: 



FeO Fe 2 0, A1 2 3 CaO 

 3.77 9.23 23.14 3.17 8.23 

 Loss by ignitiou 



MgO 



CO,, 



Traces 



98.07 » 



PA 



Traces 



Si0 2 

 48.13 



2.28 



= 98.07. 



The volcanic sabulous clay bas comparatively a large 

 proportion of magnesia, most of which must in all probabi- 

 lity be attributed to the presence of olivine. 



Stones on the Sea-Bottom. 



The largest pebbles found in the bottom-samples bad 

 a weight of from 10 to 12 grammes. The size and number of 

 the pebbles occurriug in any sucb sample, stood, as might na- 

 turally be expected, in direct proportion to one anotber. 

 The bottom-samples in which the largest pebbles occurred, 

 as a rule generally contained the greatest number. On 

 examining the series of bottom-samples tåken up from the 

 shore towards the deep water, there is excellent opportu- 

 nity to observe the gradual decrease of the pebbles in mag- 

 nitude and number. In the sequel, I have given a List 

 of the samples in which the pebbles must be said to form 

 a principal (not a partial) coustituent; and these samples 



1 This comparatively considerable loss probably arises from my 

 having omitted to determine the manganese, which in the above 

 sample would seem to have been present in somewhat greater quan- 

 tities than in the foregoiug. 



0* 



