COLUMBUS, OHIO, April 17, 1861.

Honorable SIMON CAMERON,

Secretary of War:

Two regiments will leave for Washington within three or four days, the third within a week.

WM. DENNISON,

Governor of Ohio.

EXECUTIVE DEPARTMENT, Saint Johnsbury, Vt., April 18, 1861.

Honorable SIMON CAMERON,

Secretary of War:

SIR: I have the honor to acknowledge the receipt of your telegraphic dispatch of the 15th instant as follows: "Call made on you by to-night's mail for one regiment for immediate service."

Acting upon this dispatch, I issued my proclamation for convening the Legislature, and at the same time commanded the adjutant and inspector general to call into service such of our volunteer companies of militia as were necessary to make up the complement of 780 officers and men.

I write to inform you that I have as yet received no communication from you by mail.

Our citizens throughout the State will respond with great enthusiasm to any call for sustaining the Government against the designs of the conspirators.

I have the honor to be, very respectfully, your obedient servant,

ERASTUS FAIRBANKS.

PROVIDENCE, R. I., April 18, 1861.

Honorable SIMON CAMERON,

Secretary of War:

Our troops are leaving in detachments to-day. Will be pushed forward as rapidly as transportation can be obtained. One thousand men fully armed and equipped.

W. SPRAGUE.

COLUMBUS, OHIO, April 18, 1861.

Honorable S. CAMERON,

Secretary of War:

We had made arrangements with the Baltimore and Ohio road to transport troops, and Mr. Garrett was anxious to take them until late last night, when he declined on the alleged ground that the Washington Branch will employ all his empty cars in transportation of troops. This looks ominous. We hope Harper's Ferry is safe.

W. DENNISON,

Governor.

COLUMBUS, OHIO, April 18, 1861.

Honorable SIMON CAMERON,

Secretary of War:

Two regiments leave here to-morrow morning at 3.30 o'clock via Pittsburg. Colonel [G] W. McCook, of this State, will organize them for