If the vessels of the subjects or inhabitants of one of the parties come upon any coast belonging to either of the said allies, but not willing to enter into port, or being entered into port and not willing to unload their cargoes or break bulk, or take in any cargo, they shall not be obliged to pay, neither for the vessels nor for the cargoes, at least if there is not just cause to presume that they carry to an enemy merchandizes of contraband. ARTICLE XXI. The two contracting parties grant to each other, mutually, the liberty of having, each in the ports of the other, consuls, vice-consuls, agents, and commissaries, of their own appointing, whose functions shall be regulated by particular agreement, whenever either party chooses to make such appointments. ARTICLE XXII. This treaty shall not be understood in any manner to derogate from the ninth, tenth, nineteenth, and twenty-fourth articles of the treaty with France, as they were numbered in the same treaty, concluded the sixth of February, 1778, and which make the articles ninth, tenth, seventeenth, and twenty-second of the treaty of commerce now subsisting between the United States of America and the Crown of France; nor shall it hinder His Catholic Majesty from according to that treaty, and enjoying the advantages of said four articles. ARTICLE XXIII. If at any time the United States of America shall judge necessary to commence negotiations with the King or Emperor of Morocco and Fez, and with the Regencies of Algiers, Tunis, or Tripoli, or with any of them, to obtain passports for the security of their navigation in the Mediterranean Sea, their High Mightinesses promise that upon the requisition which the United States of America shall make of it, they will second such negotiations in the most favourable manner, by means of their Consuls residing near the said King, Emperor, and Regencies. _Contraband._ ARTICLE XXIV.