July 28th.—Cloudy, but no rain.

Nothing new from Georgia or Petersburg. But a dispatch from Gen. Ewell, received to-day at half past two p.m., orders the local troops (they did not march yesterday) or other disposable forces to occupy the Darby Town, New Bridge, and Williamsburg roads, for the enemy’s cavalry were working round to our left. This was dated “27” when, no doubt, it should be 28th. The Secretary was over at the President’s office, whither I sent the dispatch. I suppose the troops were ordered out, provided there was a mistake in the date. All dispatches should have the day written out in full as well as the day of the month, for the salvation of a city might depend on it.

July 29th.—Clear and warm.

The local troops did not march until this morning, and no one supposes Richmond is seriously menaced by Grant. I believe the object of the demonstration on the part of the enemy is to draw our forces away from the vicinity of Washington.

The Chief of the Signal Corps reports, on information supposed by him to be reliable, that Gen. Early’s captures in Maryland were worth $12,000,000—consisting of some 10,000 horses, 10,000 cattle, 7000 hogs, 4000 sheep, 200,000 barrels of flour, and a large amount of bacon, etc. Also, that he got between 2000 and 3000 recruits. All this doubtful.

Mr. G. W. Lamar, Augusta, Ga., writes the Secretary of War that he knows, personally, over one hundred men who have bought exemptions, and that they are bought and sold every day at a certain price. Now will the Secretary order an investigation? Mr. L. has, or had, nine sons in the army, and he says he could have bought exemptions for all, as he is rich. And yet a poor ensigncy is refused one of his sons.

July 30th.—Clear and hot.

Dispatches from Bragg, at Montgomery, of yesterday, give no accounts of more fighting, although the press dispatches, etc. did mention four of our generals who have been wounded.

There is a revival of murmurs against the President. He will persist in keeping Bragg in command, that is “of the armies in the field,” though he does not lead any of them, and Gen. Pemberton really has command of all the batteries defending Richmond. The raiders are cutting the Georgia and Alabama Road since Bragg went South, and we have lost four pieces of artillery near this city a few days ago. Ill luck is indefensible!

To-day the enemy sprung a mine at Petersburg, but were repulsed in the attempt to rush in. This is all we know of it yet. Again it is rumored that the major parts of both armies are on this side of the river. This I believe, and I think that unless there be a battle immediately, Grant’s intention is to abandon the “siege” of Richmond at the earliest practicable moment.