The Rev. H. Lloyd on the Meteorology of Ireland. 4.51 



Oct. 23, 9 A. M. — A distinct rotatory movement, whose centre was a little 

 to the north-east of the point of junction above referred to, not far from Donagh- 

 adee. Least pressure at Donaghadee, as before. 



Oct. 23, 9 P.M. — Rotatory movement continued. Centre of vortex had 

 moved from S.W. to N. E., at the rate of about 100 mWes per diem. Absolute 

 minimum of pressure {— 29-360) at Donaghadee; increase of pressure in 100 

 miles = 0-10 inch. 



Nov. 18, 19. — A cyclone, with violent storm, crossing the island from 

 W.S.W. toE.N.E. (Plate IX. Figs. 1,2,3.) The movement of the centre of 

 the vortex appears to have been curvilinear, and to have varied considerably 

 in velocity. Between 9 p. m. of the 18th, and 9 a. m. of the following day, its 

 path was from S.W. to N. E,, and its velocity about 320 miles per diem; in 

 the succeeding twelve hours its course was nearly from W. to E., with a greatly 

 diminished velocity. The mean velocity of the wind, throughout the storm, was 

 from 45 to 50 feet per second. 



Nov. 18, 9 p. M. — Centre of the vortex on the south-western coast, about 30 

 miles to the north of Cahirciveen. Least pressure at Kilrush. Maximum ve- 

 locity of wind (in south of island) =: 60 feet per second. 



Nov. 19, 9 A. M. — -At this epoch the wind was blowing from N. at Killybegs, 

 and from S. at Donaghadee ; it was blowing from S. E. at Portru&h, and from 

 N.W. at Castletownsend ; from S. S. E. at Armagh, and from N. N. W. at Mark- 

 ree. The centre of the vortex was therefore over Ireland at that time, -and 

 between the stations above mentioned, its exact position being about 15 miles to 

 the west of Armagh. Absolute minimum of pressure (= 28-248) at Armagh; 

 increase of pressure = 31 inch. Maximum velocity of wind (in south) = 65 

 feet per second. 



Nov. 19, 9 p. M. — Centre over the Channel, to the south-east of Donaghadee. 

 Absolute minimum of pressure (= 28'410) at Donaghadee; increase of pres- 

 sure = 0-28 inch. Maximum velocity of wind (in south) = 55 feet per second. 



We have seen that the centre of the vortex was between Armagh and 

 Markree at 9 a.m. of the 19th; and, as the direction of its progressive move- 

 ment was not far from the line connecting these places, it must have passed 

 nearly centrally over both. Hence we should expect there the peculiar phe- 



VOL. xxn. 3 N 



