After some time it was determined to make the security still more complete by throwing a barricade across the stream, about a mile and a half below the city.

Several boats full of stones were sunk.

A row of stakes was driven into the bottom of the river.

Large pieces of fir wood, strongly bound together, formed a boom which was more than a quarter of a mile in length, and which was firmly fastened to both shores, by cables a foot thick, [211] A huge stone, to which the cable on the left bank was attached, was removed many years later, for the purpose of being polished and shaped into a column.

But the intention was abandoned, and the rugged mass still lies, not many yards from its original site, amidst the shades which surround a pleasant country house named Boom Hall.