Mr. Seward to Lord Lyons.

Mr. Seward presents his compliments to Lord Lyons, and has the honor to transmit herewith to his lordship a copy of a letter of yesterday from the Secretary of War, upon the subject of the condition of the prisoners confined at Fort Delaware, respecting which Mr. Seward had the honor to converse with Lord Lyons a few days since.

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Sir: I have the honor to acknowledge the receipt of your letter of the 27th instant, and to inform you, in reply, that orders have been issued for an immediate and thorough inspection into the condition of the prisoners confined at Fort Delaware.

Very respectfully, your obedient servant,

EDWIN M. STANTON, Secretary of War.

Hon. William H. Seward, Secretary of State.