17 



stemt dels ved hvert Lodskud. dels ved de sædvanlige 

 nautiske Methoder. Undersøgelsen af Strømmen i 

 Dybet vil adkræve særskilte Metfhoder og kun lade 

 sig udtbre under gunstige Omstændigheder. Disse 

 sidste Undersogelser nia a, i Regelen forbeholdes en- 

 kelte Punkter, hvor de ere at' fundamental Betydning, 

 som Færø-Shetland-Renden, Færo-Island- Klakket. Is- 

 land-Grønland-Strædet og det kolde Ishavsdyb samt 

 Nornes Banker. 



3. Bestemmelse af -Havets Temperatur i Overfladen fal- 

 der nærmest ind uuder de meteorologiske Iagttagelser. 

 Dybets Temperatur ved Buuden bestemmes ved hvert 

 Lodskud. Under gunstige Omstændigheder og paa 

 saa mange Punkter, det maa ansees at være af In- 

 teresse, tåges Rækker af Temperaturiagttagelser i 

 forskjellige Dybder fra Overfladen til Bunden med de 

 forskjellige Instrumenter, som Expeditionen hertil dis- 

 ponerer over. 



4. Undersøgelse af Harraiulet* fysiske og \chemiske For- 

 hold: Specifisk-Vægt- Bestemmelse med j Areometer. 

 Saltholdighed (Chlormængde) ved Titrering. . Luft- 

 mængde og t Kulsyremængde ved Udkogning. Deyder- 

 lig fornodne Analyser af de opsamlede Gasarter samt 

 af storre Prøver af Havvand. som medtages fra Ste- 

 der, hvor Forholdene ere typiske, maa udfores i La- 

 boratoriet efter Expeditionens Slutning. Ved de fleste 

 Lodskud tåges Vandprøver fra Eavbuiden til Bestem- 

 melse af specifisk Vægt og Saltholdighed. Paa .sær- 

 egne Steder tåges en Række Prøver af Vand fra 

 forskjellige Dybder til Undersøgelse i forskjellige Ret- 

 ninger, dels ombord, dels senere. 



5. Zoologiske Undersogelser. Indsamling af Havdyr med 

 de dertil bestemte Apparater, deres foreløbige Under- 

 søgelse og Gruppering, deres Præparation og Opbe- 

 varing. Indsamling af Specimina af Dyreriget forøv- 

 rjgt efter Lejligheden. Ved de for disse Undersogelser 

 nødvendige Operationer vindes ogsaa Prover af Hav- 

 bundens Materiale til Opbevaring. 



6. Botaniske Undersogelser: Indsamling af Specimina af 

 Planteriget. deres Præparation og Opbevaring til videre 

 Undersøgelse. 



7. Meteorologiske Iagttagelser. Stadig fortsatte Iagtta- 

 gelser af Barometer. Psychrometer, Vindens Retning. 

 Styrke og Hastigbed. Skyernes Mængde. Form og 

 Bevægelse. Søgang, Nedbør m. m. Forsøg med Hy- 

 grometer til Control for Psychrometret. med Regn- 

 maaler og Fordunstningsmaaler. med Thermometre 

 paa forskjellige Steder og i forskjelbge Højder. Maa- 

 ling af Havvandets Temperatur og specifiske Vægt i 

 Overfladen. 



détermined partly by the opération of sounding, and 



partly by the usual nautical metliods. For iuvesti- 

 gaiång deep-sea currents, recourse must be bad to 

 special methods. practicable onlv under favourable 

 circumstances. Such investigations must therefore. 

 as a rule. be contined to a few localities in which 

 tbev will be of fundamental importance, viz. the 

 Færoe-Shetland channel, the Færoe-Iceland flat. the 

 channel between Iceland and Greenlandj the cold 

 area of the Arctic Ocean, and the banks off the' 

 coast of Norway. 



3. To determine the 'Surface-temperature of the Sea, which 

 comes strictly within the meteorological observations. 

 The hottom-temperature will be détermined with every 



. sounding. Under favourable circumstances. sorial tein- 

 perature observations will be tåken, in as many local- 

 ities as may be deemed desirable, at different depths, 

 from the surface to the bottom, with the various in- 

 struments provided for the purpose. 



4. To investigate the Fhysical Conditions and Chemical 

 Constituents of the sea-water. This will comprise : spec- 

 ific gravity determinations with the areometer: salt- 

 determinations (amount of chlorine) by titration; air 

 and carbonic acid determinations liv the boiling-pro- 

 cess. All further analyses of gases collected on, the 

 Expedition, as also of. large samples of sea-water from 

 localities characterised by typical. conditions. must be 

 made in the Laboratory after the return of the Ex- 

 pedition to Norway. When soundings are takén, 

 samples of bottom-water will be generally collected. 

 for determining the specitic gravity and the amount 

 of salt. At certain stations. samples of water will be 

 collected from different depths. for examination either 

 on board or at a subsequent date. 



5. Zoological Work. comprising the collection of marine 

 animals, with the apparatus provided for the purpose. 

 their prelimiuary examination and classification. pre- 

 paring ånd preserving them on board. and the oc- 

 casional collection of other specimens of the animal 

 kingdom. When conducting the operations for cap- 

 turing marine animals, samples of the bottom will 

 also be collected. 



6. Botartiical Work. comprising the. collection of spec- 

 imens of the vegetable kingdom, and preserving them 

 for subsequent examination. 



7. Meteorological Observations, comprising regular read- 

 ings of the barometer and psychrometer; observations 

 oi' the force, direction. and velocity of the wind. the 

 form, amount. and motion of clouds. the state of the 

 sea, precipitation. &c. &c. ; experiments with the hygro- 

 meter, to control the psychrometer. with the rain- 

 guage. and with thermometers in different localities' 

 and at different heights .above the level of the sea; 

 determinations of the temperature of the sea and of 

 the specific gravity of the water at the surface. 



Den norske NordhavsexDediti 



('. Wille : Expeditionens Historie. 



