1451 
The correspondeney is considerable, in spring we have a phase: 
difference of two months, in autumn of three, it stands to reason 
that either phasedifference can be 2'/, months. 
KABEE, UI 
Monthly departures in waterlevel in cm. 
| 
I La ay vv | vr fv) ex) xt | 
| 
| 
| | 
| | | | | | 
dl ae 
2.5 4.0/8.8 | —9.0]—6.7 ae 48445 +6.7| +8.6 
fe EN Pee a) A Ss LA EN AE 
| 
} 
1.7 | 15.6 
a. Waterlevel North-Sea and Baltic. 0. Raising-power North-Sea-wind. 
c. Equatorial Current. 
It is evident from the above: 
1st. Monthly fluctuations in the velocity of the North-Kquatorial 
current (or in the strength of the North-East trade) are responsible 
for monthly fluctuations of the waterlevel in the North-Sea and the 
Baltic. 
76 
Proceedings Royal Acad. Amsterdam. Vol. XVII. 
