446 SOME RESULTS OF THE INTERNATIONAL FISHERY INVESTIGATIONS. 



been observed. 'I'heii in November the intiow of the genial Atlantic 

 water ceases and the I'.arentz Sea is again invaded by the cold Arctic 

 water of the Polar basin. 



In the North Sea similar variations in the nature and origin of the 

 water present have been observed. A good deal of attention was paid 

 to this question even before the initiation of the International In- 

 vestigations, but since 1902 our knowledge of these variations has been 



Salinity of 

 Surface-water, 

 AogUBt, 1903 



Fig. 3. 



considerably increased. The efTect of the seasonal fluctuations in the 

 volume of the Norwegian stream is well sliown by the investigations of 

 the Scottish, Danish, and Dutch sections of the organization, and will 

 easily be understood l)y a glance at the charts,* which illustrate the 

 hydrographic condition of the surface of the North Sea in 1903 and 

 1904. Fig. 3 represents the conditions in August, 1903, and it will be 

 seen that by far the greater portion of the area is covered with water 

 of 34 to 35 per 1000 salinity. This may l)e called North Sea water. 



• A. J. Robertson, Fishery and Hijdrographical Invcstiyations in the North Sea and 

 adjacent regions, p. 55, 1905 (cd. 2012). 



