Af denne Tabel freragåax det, at Differentserne mel- 
lem de ved Hjælp af Egenvægt og Chlormængde beregnede 
Saltmængder i Regelen ere meget smaa, kuu de 3 samtidig 
udførte Bestemmelser i Vandprøverne No. 261, 262 og 
263 danne i saa Henseende en Undtagelse. I)e store 
her optrædende Differentser skyldes udeu Tvivl en Feil 
ved Aflæsningen af Egeuvægterne, som for disse Vandprø- 
vers Vedkommende ere fundne altfor lave, til at de 
kunne bringes i Harmoni med andre paa Steder i Nærhe- 
den udførte Observationer. Det er saaledes i høi Grad 
paafaldende for Vandprøven No. 262, optagen fra et Dyb 
af 95 Favne (174 Meter) i ca. 8 Miles Afstand fra Land. 
at tinde Egenvægten 1.0254. medens man i de iudenfor 
liggende Fjorde, hvor Saltgehalten ellers overalt er mindre 
end paa Havet, i lignende Dyb tinder en meget større 
Egenvægt. Selv i den indelukkede Skjærstadfjord, hvor 
Overfladevandet er særdeles fattig© paa Salte, .er dog Egen- 
vægten paa Bunden funden at være 1.026, kort sagt, Egen- 
vægter som de i de omtalte Tilfælde observerede staa paa 
dette Strøg af Kysten fuldstændig uden Sidestykke. Natur- 
ligst lade disse Urimeligheder sig forklare ved at antage 
Egeuvægterne atlæste med 0.001 for lavt. da de ved denne 
Antagelse paa det Nærmeste kan bringes i Overensstem- 
melse saavel med de i de samme Vaudprøver udførte Chlor- 
bestcmmelser som med de andre Observationer fra nærlig- 
gende Puncter. 
Bortser man fra disse 3 nævnte Observationer og af 
de øvrige beregner den gjennemsnitlige halve Differents 
mellem to paa samme Vandprøve ved Hjælp af Chlortitrering 
og Aræometer udførte Saltbestemmelser, resulterer som 
Udtryk for denne 0.00904, eller man erholder under For- 
udsætning af, at Feilene i lige høi Grad skyldes Chlor- som 
Egenvægtsbestemmelserne, for den gjennemsnitlige Feil al 
en Egenvægtsbestemmelse Værdien 0.000069 og al en Chlor- 
bestemmelse 0.005. Differentserne falde, som man ser, 
snart til den ene snart til den anden Side, idet det dog 
maa bemærkes, at Chlormængden gjennemsnitlig giver lidt 
over 0.008 °/p høiere Saltgehalt end Egenvægterue, hvad 
der næsten udelukkende skyldes de nordentor den 75de 
Breddegrad udførte Observationer. 
Førend jeg nu gaar over til at give en Oversigt over 
de Resultater, som af disse Observationer lader sig udlede, 
vil det være nødvendigt parenthetisk at indslcyde nogle Be- 
mærkninger om Dybde- og Temperaturforholdene i det 
norske Hav i sine groveste Træk. Hvad der til den Ende 
her meddeles, er hovedsagelig hentet fra en af Prolessor 
Dr. Mohn forfattet Athaudling, som findes trykt i C. F. 
* Schiibelers -‘Væxtlivet i Norge.” 
Dybden i det af den norske Expedition undersøgte 
Hav, forsaavidt det ligger vestenfor en Linie fra Spitsber- 
gen til det nordlige Norge, er i større Afstand Ira Land 
overalt over 1000 Favne (1829 Meter) og gaar i Regelen 
op til mellem 1500 og 2000 Favne (2743 og 3658 Meter) 
eller endog derover. Paa Strøget mellem Beeren Eiland 
og Jan Mayen hæver sig en Ryg, hvor Dybden ikke naar 
1500 Favne. (2743 Meter), medens der saavel søndenfor 
Don norske Nordlmvsexpeditiou. Tornne: Chemi. 
This Table shows the differences in the amount of 
salt computed from specific gravity and the proportion of 
chlorine to be. as a rule, exceedingly small, the 3 determ- 
inations performed successively with samples Nos. 261, 262, 
and 263 constituting the sole exception. The great dif- 
ferences observed here must unquestionably arise from er- 
roneous readings of the specific gravity, which, as found for 
these samples, is much too low when compared with that 
determined for others obtained from adjacent localities. 
Thus, for instance, the specific gravity of sample No. 262, 
drawn ’ at a depth of 95 fathoms (174 metres), about 8 
geographical miles from land, is stated to be 1.0254, 
whereas that determined for the water of the neighbouring 
fjords, in which the amount of salt at equal depths is 
invariably less than in the open sea, was much greater. 
Even for a frith locked in as is the Skjærstadfjord. 
where the surface-water is remarkably deficient in salts, 
the specific gravity of bottom-samples was found to be 
1.0260; in short, such exceptional specific gravities 
are without a parallel on this line of coast. The most 
natural explanation of these incongruities, is afforded by 
assuming the specific gravity in each case to have been read 
0.001 too low; the results could then be made to agree 
pretty closely both with the chlorine-determinations performed 
with the same samples of water and with observations taken 
in adjacent localities. 
Now, if we disregard the 3 exceptional observations, 
and for the others compute the average half-difference be- 
tween two salt- determinations performed with the same 
sample of water by means of the areometer and titrating 
with chlorine, this will be expressed by 0.00904; or, as- 
suming the errors to lie equally in the chlorine and the 
specific gravity determinations, the mean error ol a spec- 
ific gravity determination is 0.000069, and ot a chlorine- 
determination 0.005. As will be seen, the differences be- 
tween the 2 right-hand columns of the Table are sometimes 
positive, sometimes negative; but the amount of salt ind- 
icated by the proportion of chlorine exceeds on an average 
that denoted by the specific gravity by a trifle over 0.008 
per cent, which must be referred almost exclusively to the 
observations taken north ol the 75th parallel ol latitude. 
Before proceeding to review the results deducible 
from these observations, it will be necessary to interpolate 
a few general remarks on the depth and temperature of 
the Norwegian Sea. To this end, I shall merely recapit- 
ulate what Professor Mohn has stated on the subject 
in a Memoir printed in C. K. Schiibelers "\æxtlivet i 
Norge." 
The depth of the Sea investigated by the Norwegian 
North- Atlantic Expedition was found to be as follows: 
Throughout the tract extending west of an imaginary line 
drawn from Spitsbergen to the northern extremity of Nor- 
way, it is never less than 1Q00 fathoms (1829 metres) 
some considerable distance irom land, and generally ranges 
from 1500 to 2000 fathoms (2743—3658 metres); nay. 
in some places it is even greater. Between Beeren Ei- 
10 
