Seizure of arms, &c., in Missouri.
St. Louis, May 18.
--Two pieces of cannon, several hundred muskets and riles, a number of pistols, and a quantity of ammunition, were taken by the Police Commissioners today, by order of the Federal authorities.
Sixty Colt's revolvers were seized in the hands of the American Express Company.
[Second Dispatch.]
St. Louis, May 18.
--10 P. M.--The State tobacco warehouse was visited to-day by the Federal troops, and a quantity of arms and munitions of war taken.
The city is environed with military posts.