Together with the appointment of Messrs. WADSWORTH, CARROLL, and HARTLEY, a committee, to join with a committee of the Senate to be appointed for the purpose, "to consider of and report when it will be convenient and proper that an adjournment of the present session of Congress should take place; and to consider and report such business, now before Congress, necessary to be finished before the adjournment, and such as may be conveniently postponed to the next session; and, also, to consider and report such matters, not now before Congress, but which it will be necessary should be considered and determined by Congress before an adjournment." The Senate again entered on executive business, and advised and confirmed all the remainder of the list of appointments presented yesterday, one excepted. FRIDAY, August 7. The Senate, in the absence of the Vice President, proceeded to elect a President _pro tempore_; and the votes being collected and counted, the Honorable JOHN LANGDON was unanimously appointed. A message from the President of the United States, by General Knox: _Gentlemen of the Senate:_ The business which has hitherto been under the consideration of Congress has been of so much importance, that I was unwilling to draw their attention from it to any other subject. But the disputes which exist between some of the United States and several powerful tribes of Indians, within the limits of the Union, and the hostilities which have, in several instances, been committed on the frontiers, seem to require the immediate interposition of the General Government. I have, therefore, directed the several statements and papers which have been submitted to me on this subject, by General Knox, to be laid before you for your information. While the measures of Government ought to be calculated to protect its citizens from all injury and violence, a due regard should be extended to those Indian tribes whose happiness, in the course of events, so materially depends on the national justice and humanity of the United States. If it should be the judgment of Congress that it would be most expedient to terminate all differences in the southern district, and to lay the foundation for future confidence, by an amicable treaty with the Indian tribes in that quarter, I think proper to suggest the consideration of the expediency of instituting a temporary commission for that purpose, to consist of three persons, whose authority should expire with the occasion. How far such a measure, unassisted by posts, would be competent to the establishment and preservation of peace and tranquillity on the frontiers, is also a matter which merits your serious consideration. GEO. WASHINGTON. NEW YORK, _August 7, 1789_.