511 



period a mean hourly velocity of 21 miles. It has to he remembered, however, that southerly winds were 

 comparatively infrequent; and that fact is not clearly shown in the table. 



There were many instances of strong winds from the more easterly points, and in some months mean 

 velocities of 1 9 miles per hour are shown for east-north-east and east winds, and since these means are 

 derived from a much larger number of observations they probably indicate a generally stronger air current ; 

 hut in other months the lower mean velocity is due to^ the large preponderance of lighter winds rather 

 than to the entire absence of strong ones. 



In figs. 7 to 10, however, both frequency and strength are shown, and therefore a truer conception of 

 the average character of the wind from the different points of the compass can be got from them than 

 from the table. 



