71 



De kemiske Undersøgelser af Biloculinleret viser, at 



dets mineralske Blandingsdele er af en forholdsvis ensartet 

 Sammensætning. Nogen væsentlig Forskjel i denne Ret- 

 ning tinder man imidlertid hellerikke ved Sammenligning 

 af Biloculinleret med det graa underliggende Ler. Den 

 eneste Jbestemte Forskjel mellem disse Sedimenter er Oxy- 

 dationsgraden. Det synes ikke urimeligt at Bilocuhnlerets 

 stærkere Oxydation (der er Aarsag i dets brune Farve) 

 kan være bevirket af Dyrelivet. En Modsigelse er det 

 imidlertid at Oxydationen tilsyneladende er stærkest i det 

 mest kalkfattige Parti af Biloculinleret. 



Jeg haaber senere elter en mikroskopisk Undersøgelse 

 af Bnndprøvene at kunne belyse disse og de ovrige Spørgs- 

 niaal om Slamarternes Dannelse nærmere. 



Til Slutning vil jeg udtale min Tak til DHrr. Pro- 

 fessorer Brøgger, Mohn, Sårs og Waage for den Bistand, 

 de velvillig bar ydet mig. 



Disse Undersøgelser er udførte paa Universitetets ke- 

 miske Laboratorium paa Hr. Prof. Waages Afdéling fra 

 Mai 1880 til April 1881. 



From tbe chemical investigation of Biloculina clay, 

 it appears that the mineral constituents of (bis substance 

 are comparatively uniform. Meanwhile, fchere is aoc onsid- 

 erable difference in this respect between Bilocuhna clay 

 and tbe grey underlying clay. Tbe only essential dif- 

 ference distinguishing these sedimentarv substances, emisists 



in the degrt f oxidation. It is not improbable that the 



bigher degree of oxidation distinguishing Biloculina clay — 

 and to which its brown colour must be ascribed — may 

 arise from animal life. It would seem. however, to be in 

 direct opposition to this view, that oxidation occurs in a 

 bigher degree throughout that portion of the Biloculina 

 clay which contains the least amount of lime. 



Later, after undertaking a microscopic examination 

 of the bottom-samples, I hope to throw furtber light on 

 these and tbe other questions affecting the formation of 

 oceanic deposits. 



In conclusion, I will tbank Professors Brøgger, Mohn. 

 Sårs, and AVaage for the assistance tbey have kindly af- 

 forded me. 



Tbe investigations set forth in this Memoir were 

 made in the Chemical Laboratory of the University, in 

 Professor Waage's department, and extended from May 

 1880 to April 1881. 



Kristiania. Juli 1881. 



Christiania, July 1881. 



Translated into Eusfish bv John Hazeland. 



