If this should be done, I leave it with you to manage what shall and what shall not be published. If nothing like this is done, the preliminaries of the fight are to be:-- 1st, Weapons.--Cavalry broadswords of the largest size, precisely equal in all respects, and such as now used by the cavalry company at Jacksonville. 2d, Position.--A plank ten feet long, and from nine to twelve inches broad, to be firmly fixed on edge on the ground as the line between us, which neither is to pass his foot over upon forfeit of his life. Next, a line drawn on the ground on either side of said plank and parallel with it, each at the distance of the whole length of the sword and three feet additional from the plank; and the passing of his own such line by either party during the fight shall be deemed a surrender of the contest. 3d, Time.--On Thursday evening at 5 o'clock, if you can get it so; but in no case to be at a greater distance of time than Friday evening at 5 o'clock. 4th, Place.--Within three miles of Alton, on the opposite side of the river, the particular spot to be agreed on by you. Any preliminary details coming within the above rules, you are at liberty to make at your discretion; but you are in no case to swerve from these rules, or to pass beyond their limits. In the course of the forenoon I met Gen. Whiteside, and he again intimated a wish to adjust the matter amicably. I then read to him Mr. Lincoln's instructions to an adjustment, and the terms of the hostile meeting, if there must be one, both at the same time.