...command of Bragg's army. I saw a communication from Lieut.-Col. Ruffin (Commissary Bureau), suggesting the trade of cotton to the enemy in New Orleans for supplies, meat, etc., a Mr. Pollard, of St. Louis , having proposed to barter meat for cotton, which Col. Ruffin seems to discourage. Gen. Halleck has proposed a plan of exchange of prisoners, so far as those we hold go. We have 15,000; they, 40...