...med advisable, to carry his army safely down the James, or transfer it to the other side. The rebel boasts as to what their new Merrimac (or Richmond) and its consort ram are going to do against Gen. McClellan 's army, and against our navy, are preposterous. We have a far greater naval force in the James now than we had when the first Merrimac committed self-slaughter, because, as its commander has confes...