Lieut.-Gen. Grant has directed Col. Mulford, Agent of Exchange, to say that some 200 prisoners escaped from us, when taken to Wilmington for exchange, and now in his lines, will be held as paroled, and credited in the general exchange. Moreover, all prisoners in transitu for any point of exchange, falling into their hands, will be held as paroled, and exchanged. He states also that all prisoners held by the United States, whether in close confinement, in irons, or under sentence, are to be exchanged. Surely Gen. Grant is trying to please us in this matter. Yet Lieut. Beall was executed!

March 2d.—Raining. No well-authenticated news; but by many it is believed Staunton is in the hands of the enemy, and Lynchburg menaced. Nevertheless, the government is sending a portion of the archives and stores to Lynchburg!

The clergymen are at work begging supplies for the soldiers; and they say the holding of Richmond and the success of the cause depend upon the success of their efforts, the government being null! A large per cent. of these preachers is of Northern birth—and some of them may possibly betray the cause if they deem it desperate. This is the history of such men in the South so far. But the President trusts them, and we must trust the President.

Hon. Wm. C. Rives has resigned his seat in Congress. Alleged causes, ill health and great age—over 70.

The Negro bill still hangs fire in Congress.

Roger A. Pryor is to be exchanged. He was the guest of Forney in Washington, and had interviews with President Lincoln.

The government is impressing horses in the streets, to collect the tobacco preparatory for its destruction in the event of the city falling into the hands of the enemy. This fact is already known in the North and published in the papers there. A pretty passport and police system, truly!

I saw a paper to-day from Mr. Benjamin, saying it had been determined, in the event of burning the tobacco, to exempt that belonging to other governments—French and Austrian; but that belonging to foreign subjects is not to be spared. This he says is with the concurrence of the British Government. Tobacco is being moved from the city with all possible expedition.

March 3d.—Raining and cold. This morning there was another arrival of our prisoners on parole, and not yet exchanged. Many thousands have arrived this week, and many more are on the way. How shall we feed them? Will they compel the evacuation of the city? I hope not. Capt. Warner, Commissary-General, is here again; and if assigned to duty, has sufficient business qualifications to collect supplies.

Thank God, I have some 300 pounds of flour and half that amount of meal—bread rations for my family, seven in number, for more than two months! I have but 7½ pounds of meat; but we can live without it, as we have often done. I have a bushel of peas also, and coal and wood for a month. This is a guarantee against immediate starvation, should the famine become more rigorous, upon which we may felicitate ourselves.