448 



The Rev. 11. Lloyd on the Meteorology of Ireland. 



Tabi.k XXIV. Mean Force of the "Wind for the Summer and Winter Half- Years, 



AND FOR the WHOLE YeAR. 



If to eliminate local irregularities, we combine the preceding results in 

 croups, according to the arrangement hereafter described, we find the following 

 values for the mean forces of the entire year : 



North-east, ... 1-64 North-west, . . . 1-94 



South-east, . . . 1-61 South-west, . . . 2-00 



From this it appears that the mean force of the wind is considerably greater in 

 the ivest of the island than in the east, the ratio being somewhat greater than 

 that of 1'2 to 1. There is but little difference between the forces in the northern 

 and southern portions of the island. 



Cyclonic Movements. 

 In analyzing the phenomena of rotation, the first step was to note those 

 cases in which the mean directions of the wind, in any two districts, differed by 

 90', or upwards. It was soon perceived, that no conclusion could be drawn as 

 to a general movement of the atmosphere, when the wind was very moderate, 

 the direction being then greatly influenced by local causes. Accordingly, ex- 

 cluding those cases in which the wind did not exceed a light breeze at most 

 of the stations, the remainder were examined in detail, by laying down the 



