Annexe A 
La salinité de la Mer du Nord et des eaux adjacentes 
The Salinity of the North Sea and Adjacent Waters Calculated 
on the Basis of Observations from the Period August 1902—May 1905 
Report drawn up 
by 
Martin Knupsen and Miss Kirstine SMITH 
With 15 plates 
The salinity is shown on maps and sections, which give its mean value 
represented by means of isohalines. By way of further information, there is added, 
for the surface, a map (Plate II) which also by means of curves indicates the 
salinity’s mean deviation from the mean value, and for the bottom, a map (Plate À 
which for each station gives the greatest and the least salinity found. 
For salinities greater than 35 °/oo the isohalmes are drawn with an interval 
of 0:1°/oo; on the maps and on plates XIV and XV, the same interval is used 
down to 34-50 °/o0; under 34:50 °/oo the intervals are not equally great, and there- 
fore the 34:500/00 isohaline on the maps is drawn with a heavier line than the others. 
Consequently it is only for salinities greater than 34-50 %/oo that the closeness of 
the isohalines gives a direct representation of the variation of the salinity according 
to place. 
The material that has been used in the construction of maps and sections 
consists, so far as the surface is concerned, of all available observations that have 
been made during the period of time from August 1902 to May 1905 even if the 
observations have not been made on the seasonal cruises. 
For the depths too, all available observations from the same period of time 
have been used, but here the material is mainly limited to the quarterly measure- 
ments. The only exception to this are the Scotch monthly observations in the 
waters east of Scotland. No material for the determination of salinity has been 
