*^ 



26 



Pishery Board for Scotland. 



seen that, at Dundee, the highest annual mean is found in the year 

 1903, when the Mean Sea Level {i.e. the mean of the twelve monthly 

 Mid-tidal values) was '20 ft. above the general mean for the whole 

 period of 16 years. It fell nearly steadily to a minimum of —•12 ft, 

 in 1908, and then rose again and stood in 1912 at +-14 ft. The 

 general features of the fluctuation are clearly seen from the annexed 

 figure (Fig. 8). 



The general trend of the fluctuation at Aberdeen is strikingly 

 similar to that at Dundee (Fig. 9). We have here also maxima in 

 1903 and 1912. But the amplitude of the fluctuation is, on the whole, 

 a little less at Aberdeen than at Dundee. The 1903 maximum stands 

 •13 ft. above the mean (instead of '20 ft.) and the 1908 minimum 

 stands '06 ft. below the mean (instead of ^12 ft.). The 1912 maximum, 

 however, is a little higher at Aberdeen than at Dundee, viz., "20 

 ft., as against ^14 ft. 



We have hitherto had little information that would enable us to 

 compare the fluctuations of Mean Sea Level at different stations over 

 a long period ; but Dr. Brehmer's recent paper now gives us the 

 means of doing this, for a period of ten years, for a number of German 

 and Danish ports in the North Sea and Baltic, and Dr. Rosen's paper 

 lets us compare the values at certain Swedish Stations with our own 

 for another and earlier period of 14 years. 



Table K. — Mean Annual Values of Mean Sea Level, at German and 

 Danish Ports, 1900-1909. (Difference from mean of whole 

 period, in cm.). From Brehmer, Ann. d. Hydrographie, 1913. 



* lleduced to mean of period 1900-1909. 



The above Table, which is based on those given by Dr. Brehmer, 

 shows the fluctuations of annual Mean Sea Level about the mean of 

 the whole period of ten years at these })orts. It will be seen that the 

 results at all the fourteen stations are very concordant, and the high 

 level in 1903 is especially remarkable at every one of the stations. 



Now, if we take the mean of these values, and compare them with 

 the values for (Fig. 10) Aberdeen or Dundee, after adjusting these 

 latter to the mean of the same ten vears, we see a striking corre- 



