ON THE METEOROLOGY OF IRELAND. 



363 



Mean velocity of wind = 35 feet per second ; greatest do. (south) 

 = 55 feet. The centre of the vortex appears to have passed over 

 Donaghadee about noon. At 9 A. M. the direction of the wind 

 at that place was E. S. E. ; at 12 (noon) W. S. W. ; and at 

 l h 30 m p. M. W. N. W., the shift being accompanied by strong gales 

 and heavy rain. 



Aug. 24, 9 P. M. Centre north-east of the island. Least 

 pressure at Donaghadee. Mean velocity of wind = 25 feet per 

 second. 



September 29, 30. Interesting cyclone and storm, crossing the 

 island from S. S. W. to N. N. E., with a velocity of about 270 

 miles per diem. (Plate IV., figs. 1, 2, 3.) Mean velocity of wind 

 on the 29th = 45 feet per second.* 



Sept. 29, 9 A. M. Centre of vortex off the south-western coast, 

 to the west of Cahirciveen. Force of wind greatest at the same 

 station at 3 A. M. ; but the barometer continued to fall until noon, 

 when the pressure was 28'970. Increase of pressure = 0*22 inch. 

 Greatest velocity of wind (north-west) = 60 feet per second. 



Sept. 29, 9 P. M. Centre over the island, about midway between 

 Kilrush and Dublin. Absolute minimum of pressure (= 29' 030) 

 at Markree ; increase of pressure = 0'12 inch. Least pressure in 



* The following extra observations were taken at Markree : 



