land, caught fire In Tybee Roads, and waa beached to save the lives of the crew. The Mayor of Mobile has prohibited all steamboat, and railroad proprietors from bringing negroes into that city. _ an : Fire in Montreal—The Merchants'' Exchange Destroyed-The Chief of the Fire Brigade Hurt and Two Firemen Stunned—Decision ef the American Consul at Montreal Relative to the Payment of Ad Valorem Duties.