32 JOHAN HJORT. M.-N. Kl. 



correspond accurately to each other during the Winter time. This will 

 likewise, be found to be confirmed by observations from the following 

 period, stations 303 to 312, if it be probable that the conditions during 

 the past winter have been somewhat divergent from the usual conditions 

 on account of the low atmospheric temperature. By comparing the 

 above with the Surface Chart (E) one will perceive whence the cold and 

 fresh water has reached the Spring Herring District, it being the fresher 

 layers of inconsiderabh' greater salineness than the Baltic Current which, 

 in the form of a thick layer 50 to 60 mètres in depth, has advanced 

 along the coast from Christianssand to Haugesund, and this is of greater 

 interest when it is reported that heavy South Easterly gales prevailed 

 previously. 



As a result of this it appears to me that one may draw the fol- 

 lowing conclusions: 



1. As on the shores of the Bohuslän, the low temperature of the sea 

 (less than 2 ") on the West Coast of Norway may be attributed to 

 the Baltic Current, 



2. This is forced along the coast by South Easterly Winds and is, 

 besides, dependent in the addition of fresh water from the rivers of 

 the Baltic and Norway. 



3. The warmer layers, which are now and then met with on the coast, 

 are all of a more saline nature, and that the higher the temperature 

 is, the greater will be the salineness of the water. 



4. Thus as a rule 



6 ° to 7 ° indicates Atlantic Water. 



5 " indicates North Sea Water. 



4 " to 3 ° indicates Bank Water. 



Less than 2 " (2 " to i O) indicates the Baltic Current. 

 (It must, above all, be remembered, that this only refers to the 

 »typical Winter period,« viz., February and March.) 



If we now adopt the common conclusions thus drawn, then they, to 

 a very great extent, throw light upon the observations of temperature 

 which were previously made during the West Coast Spring Herring 

 Fishery. A. Boeck 1 had already undertaken such observations. In re- 

 lation to the temperature during Winter he says: »Whilst it varied on 

 the surface from V2 to 5 " Celsius, during various Winter conditions, at 

 the depth of 10 fathoms the difference was only i » Celsius, namely be- 

 tween 3 ^ and 4 0, and at a depth of 30 fathoms it appeared to be 



1 Loc. cit. page 77. 



