The Grand Junction Canal was on Wednesday opened for barges from the Thames at Brentford, to Fenny Stratford, in Buckinghamshire, and early in the morning a number of boats started from Tring, in Hertfordshire, at which place the canal had been completed these two years past; about one o'clock they passed through Leighton Buzzard, in Bedfordshire; and a short distance before they reached Fenny Stratford the Marquis of Buckingham, accompanied by a number of friends and principal proprietors, attended by the band and a party of the Buckinghamshire Militia, met them. - They then went in grand procession to Fenny Stratford, where they were received with firing of cannon belonging to the town, and other demonstrations of joy. The Marquis and the proprietors retired to the Bell Inn to dinner