Washington Telegraph

TREATY WITH MEXICO.

The general tenor of the advices from Washington is that a Treaty had or shortly would be concluded with Mexico. We remain in the opinion expressed some time since, that Mr. Trist had made an arrangement of some kind, which will be the basis of a treaty between the two countries.

We think the following from the Union, is significant on the subject and clearly intimates a belief that Mr. Trist has come to an understanding with the Mexican authorities.

Washington is full of rumors about peace. But we cannot understand that any official accounts have been received to justify these sanguine calculations.

The only thing which we have heard of any authentic character, is a letter from a distinguished officer, who writes from Vera Cruz, on the 3d instant, to a member of Congress, reporting of the courier from the capital with rumors about negotiation, and the opinion of the commander-in-chief that we should have peace at no distant day.

We have no confirmation of these reports from official sources: though we should not be surprised if Mr. Trist without any instructions or authority, was receiving proposals from the Mexican commissioners.

The correspondent of the Baltimore Sun writes as follows on the subject:

Washington January 26, 1848.

I have no time to write you a long letter, but will endeavor to make a few points. First, as to Mr. Trist. You may take it for granted, beyond cavil or dispute, that Mr. Trist has sent to Washington a project of a treaty (not a treaty) and that the same has been submitted to the President and discussed in Cabinet council.

2d. You may take it for granted that Mr. Trist had no direct and positive authority to make a treaty, and that, consequently, the whole, thus far, is a mere ex parte arrangement between Mr. Trist on one part, and the Mexican commissioners acting without direct authority of Congress on the other.

3d. That Mr. Trist and Gen. Scott co-operate with each other in these preliminary arrangements; and that both are sanguine that a treaty on the basis contained in the project, may be ratified by the Mexican Congress.

4th. That the administration will seriously consider the proposition, and, that in all probability, the President will communicate it to both Houses of Congress; and thereby hangs a tale.

The question is, what will Congress do?—My opinion is, that they will advise a treaty, on that basis, to be made, and that the treaty itself will eventually be ratified. I do not say that all this will be done towards the close of next week, but perhaps between this and the fourth Monday in May next: and that is all I can tell you at present.

That the project of a treaty does not stop the fighting in Mexico is evident from the last advices, and that the project itself does not contain any tangible guarantee of the future, seems to be highly possible. Meanwhile, has Mr. Trist the power of disposing of the three millions?

Gen. Scott as you will have learned from yesterday's Congress, proceedings, is no longer Commander in-chief of the army. He has gone to Perote as a witness, not to be tried, and will in the course of six or eight weeks, arrive in Washington.