Agreeably to the request of the House of Representatives, communicated in their resolution of the sixteenth instant, I proceed to state under the reserve therein expressed, information received touching an illegal combination of private individuals against the peace and safety of the Union, and a military expedition planned by them against the territories of a power in amity with the United States, with the measures I have pursued for suppressing the same. I had for some time been in the constant expectation of receiving such further information as would have enabled me to lay before the legislature the termination as well as the beginning and progress of this scene of depravity, so far as it has been acted on the Ohio and its waters. From this the state and safety of the lower country might have been estimated on probable grounds, and the delay was indulged the rather, because no circumstance had yet made it necessary to call in the aid of the legislative functions. Information now recently communicated has brought us nearly to the period contemplated. The mass of what I have received, in the course of these transactions, is voluminous, but little has been given under the sanction of an oath, so as to constitute formal and legal evidence. It is chiefly in the form of letters, often containing such a mixture of rumors, conjectures, and suspicions, as render it difficult to sift out the real facts, and unadvisable to hazard more than general outlines, strengthened by concurrent information, or the particular credibility of the relater. In this state of the evidence, delivered sometimes too under the restriction of private confidence, neither safety nor justice will permit the exposing names, except that of the principal actor, whose guilt is placed beyond question. Some time in the latter part of September, I received intimations that designs were in agitation in the western country, unlawful and unfriendly to the peace of the Union; and that the prime mover in these was Aaron Burr, heretofore distinguished by the favor of his country. The grounds of these intimations being inconclusive, the objects uncertain, and the fidelity of that country known to be firm, the only measure taken was to urge the informants to use their best endeavors to get further insight into the designs and proceedings of the suspected persons, and to communicate them to me.