Several English vessels have been brought in here as prizes to the American privateers within these last six weeks, before which time we had not seen any American vessels for some months; we suppose, the ports of France being shut, they have brought such of their prizes as they do not think worth sending home into our harbours. About ten days ago a vessel belonging to Scotland, and another to Ireland, were brought in here by an American privateer, the masters of which, as soon as they came on shore, applied to their Consul, and a memorial was sent up to the English Ambassador at Madrid, the effect of which we have not as yet learnt. We have just now heard that a prize is carried into St. Sebastian's by an American privateer.