512 
Monpay, May 257TH, 1857. 
JAMES HENTHORN TODD, D.D., Presivenr, 
in the Chair. 
J. Husanp Smitu, LL.D., read a paper on the “ History and 
Foundation, by Archbishop Marsh, of St. Patrick’s Library, 
9 99 
adjoining the ancient Archiepiscopal Palace of St. Sepulchre’s. 
Sir W. R. Hamilton, LL. D., read some remarks on the 
General Equation in Quaternions for Cones of the Third 
Order. 
The Secretary presented, on the part of the Rev. J oseph 
Callwell, a sculptured slab, found in an old wall near Brook- 
borough, with the following inscription :— 
6? DOOUNChaAD 
pspic hic 
which, the President stated, was of the tenth or eleventh cen- 
tury, and signified—‘“‘A prayer for Dunchad, the Presbyter, 
here.” 
The thanks of the Academy were given to the Rev. 
Joseph Callwell for this donation to the Museum. 
