PIERCE'S DIPLOMACY IN DOMINICA.

From the New York Tribune.

PIERCE'S DIPLOMACY IN DOMINICA.

We have received some curious and interesting intelligence of a late date from St. Domingo city. It seems that, by management, underhandedness, and the conjugal representations of Messrs. Pierce and Cazneau had, by some oversight, or possibly by design, succeeded in negotiating a treaty, concluded and signed on October 5, on the part of the United States and the Dominican Republic, by which all the privileges guaranteed to any white foreigner, including rights of property, &c., in any part of the Dominican Republic, are secured to the United States—or, rather, to the citizens of the United States (for the Dominican Government, by the last step of our diplomacy, expressly excludes colored people of the empire, or of both, we are not informed) was secured to us. In return, we grant to the Dominicans right in any part of the United States that we grant to any white foreigner. Along with this concession on our part, it is true that a naval station on the Bay of Samana is secured to us; but this was not enough to commend the treaty, and to allay the fears of abolition and amalgamation which it caused at once in the bosom of Mr. Marcy, who determined to withhold it from the Senate, and to have the Embassador attempt to take it back if possible.

It seems, however, that there are serious obstacles in St. Domingo to the accomplishment of this natural wish on the part of our cautious but innovating Secretary. These obstacles the daring mind of Mrs. Cazneau proposed to overcome in a manner which would do no discredit to any feminine author of modern times. If an absurd prejudice of color is in the way; very well, abolish it! This was done. A decree was passed by the President of the Republic with dictatorial powers, and a treaty is, accordingly, being prepared by the fertile mind of Mr. Marcy's female plenipotentiary.

By way, probably, of varying the labors of this state-craft, Mrs. Cazneau has also been engaged in a correspondence with the British and French Consuls, in which, by a method of argument based on the Monroe doctrine, we presume, against the interference of European powers, she combats the counter schemes of Dominica. Their replies are said to be in very lively language, not backing up our Envoy. About the same time, three French ships-of-war, (the frigate Penelope, the brig Oreste, and the steamer Caiman,) entered the harbor, as did a Spanish war-steamer, (Francisco de Asis,) staying all three weeks, during which period, some British men-of-war were daily expected. Still, Mrs. Cazneau held her ground, undismayed by iron-sides, and hoisted the star-spangled banner, as an indication of the presence of the American diplomatic representatives. And there we will take our leave of them for the present, congratulating Mr. Marcy upon the remarkable vigor displayed by his diplomatic agent, and especially on its unequalled brilliancy in St. Domingo.