PROCEEDINGS 



THE ROYAL IRISH ACADEMY. 



1846. No. 54. 



May 25. 



REV. HUMPHREY LLOYD, D.D., President, in the 

 Chair. 



It was resolved, on the recommendation of Council, that 

 a subscription be opened for the purchase of the Domnach 

 Airgid, and that the Academy do subscribe fifty pounds. 



The President resumed and concluded the reading of his 

 paper " On the Variations of the Magnetic Declination." 



The observations at stated hours, in the Magnetical Ob- 

 servatory of Dublin, commenced November 1, 1838, the 

 hours of observation being at first limited to the day. In the 

 beginning of the year 1840, the observations vpere taken every 

 alternate hour, night and day, according to the more compre- 

 hensive scheme which received the sanction of the Royal 

 Society, and which, under the recommendation of that body, 

 has been followed in more than thirty observing stations 

 scattered over the whole globe. This plan has been in ope- 

 ration at the Dublin Observatory until January 1, 1844, 

 when it was discontinued, four years' observations having 

 been found fully sufficient for the determination of all the 



