The Southern blockade.
--The Charleston Courier, of Monday last, says:‘ The steamship Niagara has not been near this bar since Tuesday last. On the evening of that day the steamship Huntsville, one of Lincoln's armed transports, appeared off this port, and no doubt delivered orders to the Niagara to proceed to some other station.--This is certainly an extraordinary mode of attempting a blockade, and is likely to bring up some questions for the Washington Government to settle, as we understand that a claim will be made for loss sustained by several owners of British shipping who had their vessels ordered off from this port by the Niagara, and by which occurrence they lost a valuable freight, and since which other British vessels have come in and obtained most valuable charters, the entrance to the port being unobstructed. We have heard from all points along the coast, from Georgetown, S. C., to Savannah, and nothing in the shape of a war vessels has been noticed for several days.
From advices received through the Northern papers, it appears probable that the Niagara has proceeded to the Gulf, to look after privateers.
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