The failure on the part of Spain to pay with punctuality the interest due under the convention of 1834 for the settlement of claims between the two countries has made it the duty of the Executive to call the particular attention of that Government to the subject. A disposition has been manifested by it, which is believed to be entirely sincere, to fulfill its obligations in this respect so soon as its internal condition and the state of its finances will permit. An arrangement is in progress from the result of which it is trusted that those of our citizens who have claims under the convention will at no distant day receive the stipulated payments. A treaty of commerce and navigation with Belgium was concluded and signed at Washington on the 29th of March, 1840, and was duly sanctioned by the Senate of the United States. The treaty was ratified by His Belgian Majesty, but did not receive the approbation of the Belgian Chambers within the time limited by its terms, and has therefore become void. This occurrence assumes the graver aspect from the consideration that in 1833 a treaty negotiated between the two Governments and ratified on the part of the United States failed to be ratified on the part of Belgium. The representative of that Government at Washington informs the Department of State that he has been instructed to give explanations of the causes which occasioned delay in the approval of the late treaty by the legislature, and to express the regret of the King at the occurrence. The joint commission under the convention with Texas to ascertain the true boundary between the two countries has concluded its labors, but the final report of the commissioner of the United States has not been received. It is understood, however, that the meridian line as traced by the commission lies somewhat farther east than the position hitherto generally assigned to it, and consequently includes in Texas some part of the territory which had been considered as belonging to the States of Louisiana and Arkansas. The United States can not but take a deep interest in whatever relates to this young but growing Republic. Settled principally by emigrants from the United States, we have the happiness to know that the great principles of civil liberty are there destined to flourish under wise institutions and wholesome laws, and that through its example another evidence is to be afforded of the capacity of popular institutions to advance the prosperity, happiness, and permanent glory of the human race. The great truth that government was made for the people and not the people for government has already been established in the practice and by the example of these United States, and we can do no other than contemplate its further exemplification by a sister republic with the deepest interest.