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interesting particulars remain on record, which have never yet 
been collected together. 
Mr. O’ Flanagan made some remarks on Mr. Smith’s paper. 
Dr. Petrie stated that he recollected the Castle and the 
demolition of the Rath, in which some stone celts were found, 
which are now in his museum. 
John Neville, Esq.,C.E., read a paper on a new experimental 
Hydraulic Formula for finding the velocity of water in water- 
channels. 
Sir W. R. Hamilton, LL. D., read a paper on a geome- 
trical extension of the Calculus of Quaternions, as concerns 
its fundamental interpretations. 
A fac-simile of the box of St. Molash, made by the electro- 
type process, was presented by James West, Esq., M.R.1. A. 
Portion of a wooden spindle, and a bone and bronze pin, 
found at Confree Lake, near Strokestown, were presented by 
Rev. Porter Browne, of Ahascragh. 
The Secretary exhibited, by permission of Sir Erasmus 
Borrowes, Bart., a stone stamp, found in the Crimea, con- 
taining impressions of religious monograms. 
