We have another boy, born the 10th of March. He is very much such a child as Bob was at his age, rather of a longer order. Bob is "short and low," and expect always will be. He talks very plainly,--almost as plainly as anybody. He is quite smart enough. I sometimes fear he is one of the little rare-ripe sort, that are smarter at about five than ever after. He has a great deal of that sort of mischief that is the offspring of much animal spirits. Since I began this letter, a messenger came to tell me Bob was lost; but by the time I reached the house his mother had found him, and had him whipped; and by now, very likely, he is run away again. Mary has read your letter, and wishes to be remembered to Mrs. S. and you, in which I most sincerely join her. As ever yours. A. Lincoln. At the meeting of the Thirtieth Congress Mr. Lincoln took his seat, and went about the business of his office with a strong determination to do something memorable. He was the only Whig member from Illinois, and would be carefully watched. His colleagues were several of them old acquaintances of the Vandalia times. They were John McClernand, O. B. Ficklin, William A. Richardson, Thomas J. Turner, Robert Smith, and John Wentworth (Long John). And at this session that alert, tireless, ambitious little man, Stephen A. Douglas, took his seat in the Senate. The roll of this House shone with an array of great and brilliant names. Robert C. Winthrop was the Speaker. On the Whig side were John Quincy Adams, Horace Mann, Hunt of New York, Collamer of Vermont, Ingersoll of Pennsylvania, Botts and Goggin of Virginia, Morehead of Kentucky, Caleb B. Smith of Indiana, Stephens and Toombs of Georgia, Gentry of Tennessee, and Vinton and Schenck of Ohio. On the Democratic side were Wilmot of Pennsylvania, McLane of Maryland, McDowell of Virginia, Rhett of South Carolina, Cobb of Georgia, Boyd of Kentucky, Brown and Thompson of Mississippi, and Andrew Johnson and George W. Jones of Tennessee. In the Senate were Webster, Calhoun, Benton, Berrien, Clayton, Bell, Hunter, and William R. King. The House organized on the 6th; and the day previous to that. Mr. Lincoln wrote to his friend and partner, William H. Herndon:-- Washington, Dec. 5, 1847.