“_Resolved_, That the Committee on Military Affairs and the Militia be directed to consider and report whether any further legislation is necessary to prevent persons employed in the military service of the United States from aiding in the return of or control over persons claimed as fugitive slaves, and to punish them therefor.” MR. PRESIDENT,--Some time has elapsed since we listened to the persuasive speech of the Senator from Iowa [Mr. GRIMES], but, unhappily, the subject is fresh still. The character, if not the efficiency, of our armies is concerned in the complete enforcement of the late legislation with regard to slaves. If this legislation be set at defiance, or evaded, I think that our military strength will be impaired, and I am sure that our good name must suffer. I am grateful to the Senator from Iowa for the frankness with which he exposed and condemned the recent orders of several of our generals. One of these officers, though last from California, was originally of Massachusetts. He served honorably in the Mexican War, and, I believe, is an excellent soldier. His present position as a general is due partly to my exertions. I pressed his appointment. But, had I for a moment imagined he could do what he has just perpetrated, he would never have had my support. When an officer falls bravely in defence of his country, honest pride mingles with the regret that we feel. But when an officer falls as General Hooker has now fallen, there is nothing but regret. He has fallen, although not dead. I say this with pain; but I cannot say less. The order of General Hooker has been quoted by the Senator from Iowa [Mr. GRIMES]. I ask leave to read part of a letter which I have received from his camp. “I take the liberty of forwarding to you the enclosed order of General Hooker, with a report of its results, thinking that you will be interested to know how the late Act of Congress forbidding the rendition of slaves by army officers is violated, and hoping that some effort may be made to prevent such unjust and outrageous measures on the part of superior officers. “Our moral and humane feelings have been violated by having been compelled to witness the attempts of slave-holders, known to be of Secession proclivities, coming into our camps and searching our private quarters for their slaves, under the cover of a protecting order from a general who exceeds his authority.” This letter expresses feelings natural to a humane bosom. In contrast with General Hooker, I call attention to the course of General Doubleday, whose head-quarters are here in Washington. I read his order. “HEADQUARTERS, MILITARY DEFENCES NORTH OF THE POTOMAC, WASHINGTON, April 6, 1862.