Making them Useful.
--Under the late ordnance of the city authorizing the Mayor to put to work on the batteries all free negroes found in Richmond contrary to law, several able-bodied fellows have been sent out under guard, and the police are looking up others who will be similarly employed. Free negroes from other counties, before they contract here, must get the certificate of a Justice of their county of their good character, and these certificates must be endorsed by the Mayor.