34 JOHAN HJORT. M.-N. Kl. 



80 Mètres, Temperature 4.6 ° 

 100 — — 4,9 



120 — — 50 



140 — — 5.1 



If one compares the above quoted figures with Buch's Report for 

 the year 18S4, when the surface temperature was, as a rule, 5 0, and with 

 the conditions, represented b}' me, for the year 1893, it will appear that 

 on the West Coast very different conditions are to be met with in dif- 

 ferent years. The sea, down to a great depth can vary in temperature 

 and salineness in the course of a few days. All these conditions are 

 rendered comprehensible by the above mentioned hydrographical inves- 

 tigations, as one thus knows that the colder temperatures are due to 

 the inroad of the Baltic Current, whilst the warmer layers proceed from 

 the North Sea. An opportunity, however, now opens itself of studying 

 under what conditions these warm and cold layers come into the coast. 



Thus one understands how, in 1894, the warm North Sea water 

 was driven in to the coast by heavy Westerly gales, and how, on the 

 other hand, in 1895, the South Easterly storms assisted in conveying 

 the Baltic Current to the Spring Herring District. (In a subsequent 

 chapter we shall see that these great changing conditions exercise a 

 vast influence on the inrush of the herring at the spawning season). 



Observations on the temperature during the Lofoten Fishery in the 

 North are also to hand. The Inspector, Captain Knap\ reports the fol- 

 lowing for the year 1889, »From the table it will be seen that a tem- 

 perature of 4 " to 50 Celsius, was as a rule, first discovered at a depth 

 of 150 to 200 mètres.« In the Table we find that on the 4th March 



it was 



at a depth of i metre 1.5 " 



— » — 147 mètres 4.0 



During the years 1891 and 1892, the observations of temperature 

 were carried out on a large scale by Lieutenant Gade 2. He confirmed 



1 See Indberetninç til departementet for det indre for aaret i88g. (Report to the Home 



Department for 1SS9. 

 - Temperaturmaalinger i Lofoten 1891 — 1S92. (Observations on Tenijjerature in the Lofotens, 



1 89 1 — 1892). Christiania 1894. 



