525 
Sir William R. Hamilton communicated a paper by John 
T. Graves, Esq., on a fundamental theorem respecting con- 
gruences, affecting a class of complex integers which involve 
the imaginary cube roots of unity. 
The President presented to the Academy :— 
1. On the part of the Marchioness of Thomond, an ancient 
martel, or battle-axe handle, said to have belonged to Brian 
Boroimhe. 
2. On the part of Rey. J. Alder, Sund Glebe; Downpatrick, 
a collection of Roman coins, found near Downpatrick, viz.:— 
(1.) Second brass of Tiberius. 
(2) ivn'g5 e Hadrian. 
nee 35 Philippus, Sen. 
(Cp eae * Max. Hercules. 
(6.) Third brass of Licinius. 
MN? 55 9 Constantine (the Great). 
(3.) Large brass of M. Antoninus. 
(8.) Brass colonial coin of Domitian (?), washed with 
silver. 
3. On the part of Captain George P. Heathcote, a large 
brass brooch, worn by the women of Kanawar in the western 
Himalayas. 
4. On the part of Alexander Falls, Esq., two deeds of 
James II. and Charles II., the first bearing the autograph of 
James, when he was Duke of York and Earl of Ulster; and 
the second attested by Jas. Plunkett. 
W. BR. Wilde, Esq., presented to the Academy :— 
1. On the part of William Wakeman, Esq., some ancient 
quern stones; a part of a stone cross found at Donoughmore; 
and part of the market-cross at Navan. 
2. On the part of Mrs. Robert Ball, a small bust of the 
late Very Rev. Henry Dawson, Dean of St. Patrick’s; a 
bronze palstave ; a banker’s stamp ; a curious brass spur; and 
