The Rev. H. Lloyd on the Meteorology of Ireland. 461 



at others being situated in front, or in the rear, on the right hand or on the 

 the left, of the centre. In tlie remarkable cyclone of Nov. 18, 19, 1850, the 

 wind raged with greatest violence on the light hand of the centre (looking in 

 the direction of the progressive movement) ; and this appears to be the case of 

 most frequent occurrence. 



5. The vortex itself has a, progressive movement, at the rate of from 100 to 

 300 miles per diem, the average velocity of those observed being 220 miles per 

 diem. The direction of this movement is generally from S. W. to N. E. 



6. If a line be drawn through the centre of Ireland, in the direction from 

 S.W. to N. E., the track of the centres of by far the greater number of the cy- 

 clones, passing over or near Ireland, lies to the north of that line. 



7. There is reason to conclude, that these rotatory movements are caused 

 by the conflict of two rectilinear currents moving in different directions. 



Storms. 



For the purpose of eliminating local irregularities, and (to a certain extent 

 also) inequalities of estimation, I have, in examining the distribution of the 

 higher winds, combined the stations into four groups, omitting Portrush and 

 Buncrana, which lie somewhat apart. These groups are as follow : — 



I. NoRTH-EASTEEN. — Donaghadcc, Killough, Armagh. Mean latitude =: 

 54°24', mean longitude = 5° 57'. 



II. North-western. — Killybegs, Markree, Westport. Mean latitude = 

 54° 13', mean longitude = 8° 51'. 



III. South-eastern. — Dublin, Courtown, Dunmore. Mean latitude = 

 52°43', mean longitude = 6' 29'. 



IV. South-western. — Kilrush, Cahirciveen, Castletownsend. Mean lati- 

 tude = 52° 2', mean longitude = 9° 37'. 



The line joining groups i. andiv. lies, almost exactly, N. E. and S.W. ; and 

 that joining groups n. and m., N. W. and S. E. 



The following are the numbers of times in which the average force of the 

 wind, in each of these groups, amounted to a strong breeze; or the average ve- 

 locity to 35 feet per second, and upwards. 



3o 2 



