( 699 ) 



In the calculation of the frequencies of the directions independent of 



the velocity, the observations regarded as calms — and to these are 

 reckoned in the English records all velocities less than 4 miles an 

 hour — have been distributed proportionally to the frequencies of 

 direction; furtheron the frequencies North and South are assigned 

 for one half to the eastern and western quadrants. 



As is evident from the following table also in this comparison 

 systematic differences appear; in all seasons the observed frequencies 

 in the western quadrant are greater than the calculated ones, so that 

 an increase of the constant part R to which this uneven distribution 

 can be attributed, would improve the correspondence. 



TABLE VI. 



Frequencies of winddirections at Falmouth 

 for 10.000 observations. 



Proceedings Royal Acad. Amsterdam. Vol. IX. 



4S 



