16 



Vandprøverne ere overalt, hvor det Modsatte ikke 

 udtrykkelig er anført, udkogte strax efter deres Optagelse. 



Sum man ser, ligner denne Tabel overmaade meget 

 den af Dr. Jacobsen opstillede, hvad man ogsaa paa For- 

 haand kunde vente, da de undersøgte Districter fuldstændig 

 gaa over i hinanden. og naar Differentserne mellem de af Hr. 

 Svendsen og mig opførte Tal ere noget større, da kommer 

 dette ligefrem al' det af os bearbeidede Felts større Ud- 

 strækning og" deraf følgende større Uensartetbed i de phy- 

 sikalske Forholde. 



Hvad der er mest iøinefaldende, er det paafaldende 

 Phænomen, at der med Hensyn paa den relative Sammen- 

 sætning af den i Overfladevandet indeholdte Luft paa den 

 norske Nordhåvsexpedition er fundet betydeligt større Sur- 

 stofgehalt end at Dr. Jacobsen for Nordsøen opstillet, saa- 

 ledes ei- Surstofprocenten i Overfladen i Nordsøen bestemt 

 til i .Middel 33.93 °/ af den samlede Luftmængde, medens 

 den tor det af ilen norske Expedition i L876 og 77 under- 

 søgte Strøg somlenlbr den 7<>de Breddegrad, beløber sig 



The. samples of water were all. excejtt wben the re- 

 verse is stated. boiled immediately on being drawn. 



As will be seen. this Table agrees very closely 

 witb that prepared by Dr. Jacobsen, which was indeed 

 to be expected. since the tracts investigated coalesce ; and 

 the somewhat greater differences exhibited by Mr. Svend- 

 sen^ and my own figures arise simply from the region 

 explored by the Expedition having been more extensive. 

 involving greater dissimilarity in the physical conditions. 



With regard to the relative composition of the air 

 in surface-water, the proportion of oxygen was. strange to 

 say, on the Norwegian Xorth-Atlantic Expedition found 

 to be considerably greater than that given liv Dr. Jacobsen 

 tor the North Sea. The mean proportion of oxygen in 

 the surface-water of the North Sea he determined to he 

 33.93 per cent ol' the total amount of air, whereas the mean 

 proportion lor the tract of the North-Atlantic stretching 

 south of the 70th parallel of latitude, that investigated hy the 



