Tides in the Mediterranean and Adjacent Seas 



369 



the explanation just given of the tides of the North Sea, which is based prin- 

 cipally on the M 2 tide, is correct and it seems that the criticism by Sterneck 

 against this mode of interpretation is unjustified (see Defant 1925 p. 231). 

 There still are, of course, many questions which need explanation, which will 

 become possible when we have more and better tide observations, especially 

 by means of gauges in the open ocean. 



A problem still waiting for a solution is the interpretation of the spring 



Fig. 154. (a) Lines of the same time interval between upper culmination of the moon in 

 Greenwich (solar hours) and high water. 



24 



