Mr. Seward to Mr. Adams.

Jonathan Amory, Despatch Agent, Boston:

Send the following to Mr. Adams by steamer of to-day:

Reports received during the last night seem to prove that the insurgent raid on the Baltimore and Ohio railroad has been exaggerated, and that it affords no ground for serious apprehension. We have called out the militia in Pennsylvania, New York, and New England.

General Hunter is on the track of the raiders.

WILLIAM H. SEWARD.