Mr. Seward to Lord Lyons.

My Lord: I have the honor to acknowledge the receipt of your communication of the 21st instant, respecting the case of the British wrecking schooner Dart, alleged to have been molested by a United States cruiser supposed to have been the Vanderbilt, while saving cotton, in British waters, which had been thrown overboard by a vessel which the cruiser was pursuing. In reply, I have the honor to inform your lordship that I have referred the matter to the Navy Department for investigation.

I have the honor to be, with high consideration, my lord, your obedient servant,

WILLIAM H. SEWARD.

Right Hon. Lord Lyons, &c., &c., &c.