Tides in the Mediterranean and Adjacent Seas 



371 



cause of this discrepancy; it will presumably be due to the fact that the North 

 Sea basin responds differently to each partial tide frequency, and thus the 



(a) 



(b) 



Fig. 155. Properties of the tides in the North Sea (Merz). (a) Lines of equal retardment 

 at spring tide in hours, (b) lines of equal ratio of the range at neap tide to spring tide in 



per cent. 



24* 



