Meteorology. — "On the relation between meteoroh(jlc(il conditions 

 in the Netherlands and some circumjacent places. Difference 

 of atmospheric pressure and vund." By Dr. J. P. van der Stok. 



1. In previous conjiminications it was proved tliat the relation 

 between direction and magnitude of tlie gradient of atmosplierie 

 pressure on the one hand, and force and angle of deviation (between 

 wind and gradient) of the wind on the other hand is not a constant 

 quantity, but varies with the azimuth of the gradient ') and with 

 increase and decrease of pressure difference '). 



If we select from the gi'adients, as calculated for the Netherlands 

 and publisiied in the weather charts, those pointing to eight points 

 of the compass, then, for the period 1904 — 1910, the wind at De 

 Bilt and the whole year, Ave find the following results: 



TABLE I. Average values of angle of deviation a and force of the wind 

 (Beaufort scale) for different directions of unity gradient. 



Various objections against the method followed in this inquiry 

 may be raised. 



Angles of deviation smaller than 45" are left out of consideration 



1) On the angle of deviation between gradient of atmospheric pressure and air 

 motion. Amsterdam. Proc. Sci. K. Akad. Wet. 14, 1912 (865—875). 



2) The relation between changes of the weather and local phenomena. Ibid. 14, 

 1912 (856—865). 



