31 



being of course different at the different epochs. We thus 

 find that the centre of the vortex had a progressive motion 

 from W. S."W. to E.N. E. ; and that it reached the western 

 shores of Ireland about 3 a.m. of the 19th, and quitted the 

 north-eastern about 3 p.m. of the same day. The position of 

 these circles at 9 a. m. of the 19th, together with the direc- 

 tion of the wind at the several stations, is shown in the annexed 



onaffhadee 



* Castletownsend 



diagram. The centre of the vortex was then over the north 

 of the island, in lat. 54° 20', long. 7° 30', very nearly. 



