252 



" A portion of the mound may still be seen overhanging 

 the cliff, and if the section of it next the cliff be examined, 

 the bones and charcoal may be easily observed. 



" I gave the particulars of this discovery to Mr. D' Alton 

 when he was about to publish his Memoir of Drogheda, and 

 it is referred to in the first volume of his History of Drog- 

 heda. I stated to Mr. D' Alton that there was no tradition 

 of the origin of this vast funereal pile, but he quotes a passage 

 from Dr. Hanmer's Chronicles of Ireland, from which it 

 would appear that a battle was fought between an army of 

 marauders and Dermott Lamhdearg, King of Leinster, 

 about the commencement of the fifth century, at Knock-na- 

 cean, i. e., the Hill of Heads, the marauders having landed 

 at the ' Follesse of Skerries.' 



" Rude stone coffins, composed of the common flag-stones 

 of the country placed together in the form of a coffin, with 

 skeletons, are found very frequently in this neighbourhood. 



" Although it is unconnected with the foregoing, 1 may as 

 well state, as a matter of curiosity, that Mr. Burdon, about 

 the same time, when visiting the Hill of Tara, discovered 

 and brought home to me a regular joint of a basaltic column, 

 brought, no doubt, in the days of Tara's greatness from the 

 Giant's Causeway. He discovered it accidentally; it was 

 covered by the sod, and was not far from the pillar supposed 

 to be the Lia Fail." 



Rev. Samuel Haughton, Fellow of Trinity College, read 

 a paper on " The Equilibrium and Motion of elastic solid, 

 and fluid Bodies." 



The object of the paper is to deduce, by the method of the 

 ' Mecanique Analytique' of Lagrange, the laws of solid and 

 fluid bodies from the same physical principles, and to discover 

 by the same method the conditions at the limits. 



The principle from which Mr. Haughton deduces the 

 equations is, that the molecules of solid and fluid bodies act on 

 each other in the direction of the line joining them, with a 



