Sir:--I arrived here this afternoon, and I hope to report to you in person Saturday. I had free conversation with the President, General Scott, Mr. Seward, Mr. Chase, General Cameron, and Mr. Blair, upon public affairs. The impression I received from all, except perhaps Mr. Seward, was favorable to a vigorous prosecution of the war. Mr. Seward repeated his words of December and February. "The crisis is over." It is, however, understood at Washington that Mr. Seward favors vigorous measures. Mr. Chase says that the policy of the Administration is vigorous and comprehensive, as sure to succeed in controlling the Rebellion, and preserving the whole territory of the Union. I will only say now, that I left Washington with a more favorable impression of the policy of the Government than I entertained when I left Boston. General Cameron agreed to authorize Massachusetts to raise two regiments in addition to that of Dwight. The papers were all made, and only a Cabinet meeting prevented their completion on Tuesday. I did not wish to remain another day, and I left the papers with the chief clerk; and I also received the assurance of Colonel Ripley, that he would give personal and prompt attention to transmitting them to Boston. I shall expect them on Sunday. Colonel Ripley issued an order on Tuesday for rifling cannon. Mr. Forbes' letter aided very much. I am truly your most obedient servant, GEORGE S. BOUTWELL. I was in Washington again in the month of May, and I made a third visit the second day after the first battle of Bull Run. At one of these visits I met General Hooker, at Mr. Sumner's quarters on F. Street. He had then recently arrived from California and his appearance indicated poverty. His dress was worn, and his apparel was that of a decayed man of the world. He had called upon Senator Sumner to secure his aid in obtaining the command of a Massachusetts regiment, he being a Massachusetts man by birth. In the course of the conversation Hooker said that if he could obtain a regiment, he would come to the command of the army, and take Richmond. When he came to the command of the army it seemed possible that his vain boast might be fulfilled in both particulars. The cause of his failure may be the subject of debate, but, at Chancellorsville, his orders were not obeyed. It is probable, however, that Hooker lacked the qualities of a great commander. He inspired his soldiers with enthusiasm, he was brave, and his heart was in the cause. With many faults, he was one of the great soldiers of the war, and with less sensitiveness of spirit he might have been one of its renowned chieftains. I have obtained from the War Department copies of two letters that I wrote to Gen. Cameron, Secretary of War, dated at Havre de Grace, April 26, 1861. They throw some light on the war movements at that time. HAVRE DE GRACE, _April_ 26, 1861. HON. SIMON CAMERON: