Alexandria Gazette & Daily Advertiser

From the New-York Gazette.

Rhinebeck, Sept. 21, 1820.

Messrs. Lang, Turner & Co.

On Sunday last, the 17th inst. about 7 o'clock in the morning, several of my workmen were on the banks of the Hudson, and near my house, when they observed a man haul up a boat in a cove, a little to the west of them. He ran towards them, appeared wild, and passed with great strength of body. From what they say, he was certainly in a state of mental derangement. He was dressed in a sailor's habit, and appeared to be about 5 feet 8 inches high. On going to the cove, they found an elegant pleasure boat, with "Rosalie" painted in the stern, having sails, rudder and oars, as also a small bundle of clothes, some of which were marked "I. Meanough," a jug in which there had been rum, and a small bundle of bread and pork. From his being so well provided, one would suppose that he was not mad; but may have been guilty of some crime, and then running from justice. He must have come from New-York, as the wind was strong from the south for the three preceding days; and the boat has also the appearance of one from that quarter. One of my people has her in safe keeping till the owner comes to make his claim. Your giving publicity to this letter may render service to some person concerned.

I am, gentlemen, your obt. svt.

JAMES THOMSON.

P. S. He has passed over the ferry to Kingston in great haste.

On receipt of the above, one of the editors went on board the ship Rosalie, Captain Merry, presuming that the boat above described belonged to that ship; this, however, is not the fact; but Capt. Merry informs us that a man and woman came alongside of his ship about three weeks since, in a boat exactly similar to the one described by Mr. Thompson--and it may turn out, that the man has got rid of his companion in some improper manner. We thank Mr. Thompson for his communication, which, no doubt, will lead to a discovery of the mystery.