Bearing in mind the following facts: Firstly, that you are the challenging party. Secondly, That in a sermon delivered by you in the city of Washington, before President Grant and his Cabinet, Members of Congress and many other prominent gentlemen, you assumed to prove that "God's law condemns the union in marriage of more than two persons," it certainly seems strange that your representatives should persistently refuse to have any other question discussed than the one "Does the Bible sanction Polygamy?" It appears to the representatives of Mr. Pratt that if Dr. Newman could undertake to prove in Washington that "God's law condemns the union in marriage of more than two persons," he ought not to refuse to make the same affirmation in Salt Lake City. Mr. Pratt, I discover, entertains the same opinion, but rather than permit the discussion to fall, he will not press for your original proposition, but will accept the question as you now state it: "Does the Bible sanction Polygamy?" I sincerely trust that none of the gentlemen forming the committee will encumber the discussion with unnecessary regulations, which will be irksome to both parties and unproductive of good, and that no obstacles will be thrown in the way of having a free and fair discussion. Respectfully, BRIGHAM YOUNG. THE BIBLE AND POLYGAMY. DOES THE BIBLE SANCTION POLYGAMY? DISCUSSION BETWEEN PROFESSOR ORSON PRATT AND DR. J. P. NEWMAN, CHAPLAIN OF THE U. S. SENATE, IN THE NEW TABERNACLE, SALT LAKE CITY, AUGUST 12, 13 AND 14, 1870. FIRST DAY. At two o'clock yesterday afternoon Professor Pratt and Dr. Newman, with their friends and the umpires, met in the stand of the New Tabernacle: the two former gentlemen prepared for the discussion of the question, "Does the Bible sanction Polygamy?" An audience of three or four thousand--at least half of which was of the gentler sex--assembled to hear the discussion. At a few minutes past two, the audience was called to order by Judge C. M. Hawley, the umpire of Dr. Newman, on the negative, he (fortunately we presume) being absent from his district at this juncture--and Elder John Taylor offered the opening prayer. The same umpire, who somehow or other had got the idea that he was the master of ceremonies on the occasion, and that he would relieve the umpire of the affirmative side from all his duties, then introduced Professor Pratt to the audience, which, as the professor was so well known and the umpire almost unknown, created a slight titter, which, however, speedily subsided, and the assemblage listened quietly to the ARGUMENT OF PROFESSOR ORSON PRATT.