The Rev. 11. Lloyd on the Meteorology of Ireland. 415 



upon the distxibution of temperature, and the varying position of the isothermal 

 lines /rom month to month. 



3. The non-periodic variations of pressure, temperature, and humidity, and 

 their connexion with the course and direction of the aerial currents. 



4. The phenomena and laws of storms, whether revolving or otherwise. 



5. The periodical winds prevaiUng during certain seasons, and their modifi- 

 cations from geographical position or local causes. 



6. The course and rate of progress of atmospheric waves. 

 Concurrently with the meteorological observations, it was determined to 



institute an extended series of observations on the phenomena and laws of the 

 tides around the coasts of Ireland, the results of which will shortly be laid before 

 the Academy by Mr. Haughton. The observations of the former class having 

 been intrusted by the Council to my care, for reduction and discussion, I now 

 proceed to lay before the Academy their principal results. It will be neces- 

 sary, however, in the first instance to describe the plan of observation itself 



Stations. — The meteorological stations are : — 



1. The Coast-guard stations atPortrush, Buncrana, Donaghadee, Courtown, 

 Dunmore East, Castletownsend, Cahirciveen, and Kilrush ; and, for observa- 

 tions of sea temperature only, those of Cushendall and Bunown. At all of 

 these the observations were taken, with the permission of the Lords of the 

 Treasury and of the Comptroller-General, by the boatmen belonging to the 

 Coast-guard Service, the individuals having been specially selected for the duty 

 by the inspecting officers, and having been instructed in the mode of observing 

 by members of the Council of the Academy. 



2. The Lighthouses at Killough, Inishgort, and Killybegs, where, with per- 

 mission of the Ballast Board, the observations were made by the lightkeepers, 

 instructed as before. 



3. The Astronomical Observatories of Armagh and Markree, where the obser- 

 vations were taken by the Observatory assistants, with the permission of Dr. 

 Robinson and Mr. Cooper ; the Magnetical Observatory of Dublin, where they 

 were made with the permission of the Board of Trinity College ; and the sta- 

 tions at Portarlington and Athy, where they were undertaken by Dr. Hanlon 

 and Alfred Haughton, Esq. 



