be so agreed upon shall, when duly ratified, be regarded as forming a part of the present treaty, and shall have the same force as those now contained in it.
Article XVII.
The present treaty shall be ratified, and the ratifications shall be exchanged at London, within the space of six months, or sooner, if possible.
In witness whereof, the respective plenipotentiaries have signed the same, and have affixed thereto their respective seals.
Done at London, the twenty-sixth day of December, in the year of our Lord one thousand eight hundred and twenty-six.
(L.S.) William Huskisson.
(L.S.) James L. Morier.
ADDITIONAL ARTICLES.
Article I.
Whereas, in the present state of Mexican shipping, it would not be possible for Mexico to receive the full advantage of the reciprocity established by the Articles V., VI., VII., of
