ST. LOUIS, Mo., Wednesday, Aug. 14.

The following proclamation has just been issued:

HEAD-QUARTERS, WESTERN DEPARTMENT, ST. LOUIS, Aug. 14, 1861.

I hereby declare and establish martial law in the City and County of St. Louis. Major J. MCKINSTRY, United States Army, is appointed Provost-Marshal. All orders and regulations issued by him will be respected and obeyed accordingly.

(Signed) J.C. FREMONT,

Major-General Commanding.

ARREST OF THE PRESIDENT OF THE BOARD OF POLICE COMMISSIONERS OF ST. LOUIS.

ST. LOUIS. Mo., Wednesday, August 14.

M[???] MCKINSTRY, the Provost-Marshal appointed by Maj.-Gen. FREMONT, has arrested JOHN A. BROWN LEE, President of the Board of Police Commissioners of this city, and appointed in his place BASIL DUKE. The laws of the City and State will be executed without change.