299 



Monday, May 24th, 1852. 



THOMAS ROMNEY ROBINSON, D. D., President, 

 in the Chair. 



Mr. J. Hub and Smith exhibited a stone ui'n, with a glass 

 urn, found in a tumulus at Dunadry, county of Antrim. 



On its surface there was a rich, black, loamy soil, and the 

 farmer on whose land it was, having resolved to spread it over 

 the adjoining ground, proceeded to remove it for that purpose, 

 and in doing so came to the cairn, in which he discovered, at 

 a depth of three feet from the surface, on the eastern side, and 

 lying horizontally, a human skeleton, having on its head a ring 

 of lignite, and at the feet the stone urn, and a little glass ring. 

 The um was distinguished from those found hitherto, by hav- 

 ing handles at the sides and a brass cover upon the top. The 

 mound, which was exceedingly large, was now entirely effaced. 



A vote of thanks was passed to Mr. Smith. 



Sir William R. Hamilton read a supplementary Paper in 

 illustration of his communication of the 8th of December last, 

 on the connexion of Quaternions with continued fractions and 

 quadratic equations. 



In this paper he assigned the four Biquaternions which are 

 the imaginary roots of the equation 



q* = qi+j; 



and showed that these were as well adapted as the two real 

 roots assigned in his former communication, to furnish the real 

 quaternion value of the continued fraction, 



He also showed that when the continued fraction 



b 



u * = hr ) 







■f J 



2 F 



