SECT. 5] 



LONG-TERM VARIATIONS IN SEA-LEVEL 



597 



10° 



15' 



20" 



25" 



30" 



35° 



65" 



60' 



55' 



Uplift during past 7000 

 years, in meters 



Present rate of uplift, 

 cm per century — — 



Stations data available 



Fig. 1. Postglacial uplift in Fennoscandia. (After Gutenberg, 1941, Fig. 3.) 



D. The Long-Period Astronomical Tides 



Table II contains a list of the tides of longer period than a day. The theo- 

 retical amplitudes of their equilibrium forms have been taken from Doodson's 

 harmonic development of the tide-generating potential (Doodson, 1921). 



