The date of a letter from London will doubtless be as unexpected to you as it was unforeseen by myself, a few days ago.  On the 27th of the last month, Colonel Smith arrived in Paris, with a letter from Mr. Adams, informing me that there was at this place a minister from Tripoli, having general powers to enter into treaties on behalf of his State, and with whom it was possible we might do something, under our commission to that power:  and that he gave reason to believe, he could also make arrangements with us, for Tunis.  He further added, that the minister of Portugal here had received ultimate instructions from his court, and that, probably, that treaty might be concluded in the space of three weeks, were we all on the spot together.  He, therefore, pressed me to come over immediately.  The first of these objects had some weight on my mind, because, as we had sent no person to Tripoli or Tunis, I thought if we could meet a minister from them on this ground, our arrangements would be settled much sooner, and at less expense.  But what principally decided me, was, the desire of bringing matters to a conclusion with Portugal, before the term of our commissions should expire, or any new turn in the negotiations of France and England should abate their willingness to fix a connection with us.  A third motive had also its weight.  I hoped that my attendance here, and the necessity of shortening it, might be made use of to force a decisive answer from this court.  I therefore concluded to comply with Mr. Adams’s request.  I went immediately to Versailles, and apprized the Count de Vergennes, that circumstances of public duty called me hither for three or four weeks, arranged with him some matters, and set out with Colonel Smith for this place, where we arrived last night, which was as early as the excessive rigor of the weather admitted.  I saw Mr. Adams immediately, and again to-day.  He informs me, that the minister of Portugal was taken ill five or six days ago, has been very much so, but is now somewhat better.  It would be very mortifying, indeed, should this accident, with the shortness of the term to which I limit my stay here, defeat what was the principal object of my journey, and that, without which, I should hardly have undertaken it.  With respect to this country, I had no doubt but that every consideration had been urged by Mr. Adams, which was proper to be urged.  Nothing remains undone in this way.  But we shall avail ourselves of my journey here, as if made on purpose, just before the expiration of our commission, to form our report to Congress on the execution of that commission, which report, they may be given to know, cannot be formed without decisive information of the ultimate determination of their court.  There is no doubt what that determination will be:  but it will be useful to have it; as it may put an end to all further expectations on our side the water, and show that the time is come for doing whatever is to be done by us, for counteracting the unjust and greedy designs of this country.  We shall have the honor, before I leave this place, to inform you of the result of the several matters which have brought me to it.