62 Dr. van Rijekevorsel on Irregularities in the Yearly 



me that this is indeed more widely spread and more enigmatic 

 than I at first supposed. However, I think I am able now 

 to point out with a certain degree of probability where it 

 originates. This is the first case in which I really could do 

 more than show the direction in which this origin ought to be 

 found. 



Arbroath 

 Valencia 



Eothesay 



Ihorshayn 

 Berufjord 



Greenwich . . 



Vlissingen .. 

 TheHelder .. 



Christiansand 



This second diagram shows for a certain number of stations 

 the daily mean temperature for the mouth of July and parts 

 of June and August. The order in which the curves are 

 arranged is more or less the same as that in which the im- 

 portance of this minimum decreases. At the same time — and 

 this is important — the order is such that the first places are 

 very near some point to the west of Scotland, and that the 

 others gradually go further and further away from that centre. 



Onlv four of these show a decided minimum : the most 

 pronounced one occurs at Arbroath in the east of Scotland, 

 and the next at Valencia ; the two others are Rothesay near 

 the west coast of Scotland and Thorshavn on the Faroe Islands. 



After these places the minimum assumes a less decided 

 character ; it is no longer a valley, but only a less steep 

 incline of the ascending curve. These stations form another 

 circle round Scotland ; they are : Berufjord. on the east coast 



