1901] The Hydrography of the North Ocean. 23 



PL I. 



May 1897. Yellow curve (table III). 



It will be seen that the Gulf Stream area is comparatively nar- 

 row, with high surface temperatures. Average: 5°,88 C. Maxi- 

 mum: 6°,8 C. 



May 1898. Black curvés (tables VII, IX). 



In May 1898 the Gulf Stream area is very much expanded, 

 and there are high temperatures in the surface. 



Table YII gives an average of 5°,68 C, maximum: 6°,6, and 

 tab. IX gives, Average: 5°,61, max: 6°,3. 



A comparison of the two black curves gives support to the 

 opinion that the stream in May, 1898, bends abruptly towards the 

 east, between the 1 7 Ist and 72nd degrees of latitude. 



May 1899. Red curves (tab. XI, XIII). 



Also in May 1899 the Gulf Stream area has a large transver- 

 sal extent. But there is, however, a great diiference between the 

 situations in May, 1898, and in May, 1899, as in the latter year 

 there occurs a strong reduction of temperature. 



Tab. XI gives, average: 3°,69, maximum: 5°,4. 



Tab. XIII gives, average: 3°,92, maximum: 5°,0. 



May 1900. Blue curve (tab. XY). 



The extent of the Gulf Stream area is almost the same as 

 in May, 1897, but it is much more narrow than in 1898 and 1899. 

 On the other hand temperature is higher than in 1899, but lower 

 than in 1897 and 1898. From tab. XY we get an average of the 

 area: I°,58, and maximum: 5°,2. 



Pl. IL 



Sept. 1897. Yellow curve (tab. Yl). 



A narrow zone of Gulf Stream water lies along the Norwegian 

 coast to the 7 Ist degree of latitude. Temperature in that area, 

 about 8° C. 



Sept. 1898. Black curve (tab. YIII). 



The course line cuts a comparatively broad branch of Gulf 

 Stream water W off B. Eiland. Temperature in that branch, up 

 to 8°,6 C. 



