IMPORTANT NEWS FROM ST. DOMINGO—PROGRESS OF GENERAL ANNEXATION.

In further proof of the existence of this frightful conspiracy against the freedom and independence of Hayti, read, mark and inwardly digest the extraordinary contents of the following articles from the New-York Herald—

IMPORTANT NEWS FROM ST. DOMINGO—PROGRESS OF GENERAL ANNEXATION.

The news which we have received here, during the last two days, by two vessels from different ports of the Island of San Domingo, or Hayti, in the West Indies, and which will be found in this day's paper, is of the highest importance to this country and to the world—nay, even to the course and progress of republican government in this hemisphere, for all time to come.

Through the energy and industry of a special agent and correspondent, whom we sent to San Domingo last autumn, we have received, exclusively, a series of several interesting and diplomatic correspondence which have already passed between the government of the United States and that of San Domingo, preparing the way for the great movement of the annexation of the latter to the former, according to the same policy, or plan, which was pursued towards Texas, and which has, in a few years, terminated in the absorption or annexation of the latter into this great republic of the North. These documents consist of a proposal, presented to the United States government at Washington, by the agent of the Dominican republic, some time ago, together with copies of highly interesting letters, written by certain public functionaries in that island, and addressed, during the last summer, to Mr. Hogan, the agent of the United States, then in San Domingo, to which island he was sent by Mr. Calhoun, then Secretary of State, in order to investigate the condition and ascertain the importance and capabilities of that new republic in the West Indies.

Thus far, the movement has been highly prosperous and successful. The war between San Domingo and Hayti is rapidly coming to an end, and it is highly probable that the black and sturdy republic will be overcome by the white and more civilized races of the other. As soon as that point shall have been accomplished, there will follow other movements, leading to the natural termination of the annexation of the whole island to the United States.

It will be perceived that the diplomatic correspondence which we give, only comes up to the period at which Mr. Hogan, the United States agent, left San Domingo. The report which Mr. Hogan has already made to the Secretary of State at Washington, or the action of our government on that information, we can only as yet conjecture. One thing, however, is certain, that these great diplomatic movements, of such mighty interest to the destiny of the West Indies, and to the world in general annexation, were not alluded to in the slightest degree, in the recent message of the President. How far, therefore, the present administration may be carrying out this magnificent policy, so auspiciously begun under Mr. Calhoun, we can only conjecture. We have no doubt, however, but that such is the policy of the day—to the spirit of the age—to his destiny—and to the great principles of republican progress, which we have seen so happily begun in the annexation of Texas.

Hispaniola, or the island of San Domingo, favored by God and nature, is surely marching, with a step as regular as the movement of the spheres, to accomplish that great destiny which is allotted to her to fulfil—that is, the union and incorporation, in one great and mighty republic, of a grand confederation of regular democracies, the whole of the islands of the West Indies, and all the lands thereunto naturally belonging. In Cuba, in Mexico, and, indeed, in all the neighboring countries, there is that will, in the course of a few years, lead to the realization of every article and a central system. The difference between England and the United States, respecting the 49th parallel in the Oregon Territory, is a mere bagatelle compared to the movements contemplated and begun in reference to those portions of the southern hemisphere, not yet united to this republic. Our government might, if necessary, easily settle that question by giving England all she asks in Oregon—for in less than a quarter of a century, she can pay with the whole peach, fall into the lap of the United States, along with other territories to which it may be attached. The annexation of the whole of the West Indies, and a stable government in San Domingo, in Mexico and in the California territories, will only be the coming events that already cast their shadows over the present and the future, and make the mountains of Europe look pale with fear.