529 
quaternions, might itself be extended so as to form a theory of 
what Mr. Graves at the time proposed to call 2”-cons : but in 
a letter written shortly afterwards, doubts were expressed re- 
specting the possibility of this additional extension, from oc- 
taves to sets of sixteen. 
The special thanks of the Academy were given to Lord 
Farnham, for his Donation to the Museum of the following 
Collection of Antiquities : 
Two Gun Barrels, one Gun Lock, three Cannon Balls, 
several fragments of Cannon Balls and Shells, four Leaden 
Bullets, and one Sword, from Cloughoughter Castle. 
Curious ancient Keys, from Newtownbarry, and Bally- 
Jamesduff. 
Fifty-five Flint Arrow- Heads. 
Six Flint Knives. 
Twenty-four Bronze Celts, of different patterns. 
An ancient Hand-miil, perfect ; the top Stone of another ; : 
and a round Grind Stone. 
An old Glass Bottle, from Cavan. 
A Sling Stone, from Dunshaughlin. 
One perfect Bronze Sword, found at Corchor, Co. Cavan, 
and fragments of another. 
Five Blades of Bronze Daggers. 
Two Bronze Spears. 
Four Bronze Pins, with Rings. 
Two Bronze Bosses. 
A Brass Spoon. 
A Brass Spur, found at Shaneloon, Co. Cavan. 
A Brass Cross. 
A Silver Cross. 
A Brass Pistol. 
A Snuff Box made from a Cannon used at the Siege of 
— Derry. 
A Snuff Box found on the battle ground at Vinegar Hill. 
