— 21 — 



B. HELLAND-HANvSKN 



If we compare the different years with each other in the light of what we 

 have learned from figs. 5 — 8, we will arrive at quite interesting results. The 



XHE.MORTH SE.« 



OTRA SHALL 



1905 



.SOUTHEIRM AREAS 



MIDDLE AREAS 



MORTHE.Rn AREAS 



« 20 23 30 35 ''O hi 50 ,5 20 25 JO 35 'i-O '.S 



Ltn&TH incEriTI.'-IETERS LEMÄTW IN CEMTll-lE-TELRS 



Fig. 7 Fig. 8 



uppermost curves in these figures ("The North Sea") are placed in juxtaposition 

 in fig. 29 (the broken lines). 



