The papers give forth an uncertain sound of what is going on in the field, or of what is likely to occur. Unless food and men can be had, Virginia must be lost. The negro experiment will soon be tested. Custis says letters are pouring in at the department from all quarters, asking authority to raise and command negro troops: 100,000 recruits from this source might do wonders.

I think Lee’s demonstrations on Grant’s front have mainly in view the transportation of subsistence from North Carolina.

Mrs. President Davis has left the city, with her children, for the South. I believe it is her purpose to go no farther at present than Charlotte, N. C.—rear of Sherman. Some of their furniture has been sent to auction. Furniture will soon be low again.

It is now believed that the government will be removed with all expedition to Columbus, Ga. But it is said Richmond will still be held by our army. Said! Alas! would it not be too expensive—“too much for the whistle?”

Shad are selling at $50 per pair. If Richmond should be left to strictly military rule, I hope it will rule the prices.

It is reported that Gen. Johnston has fallen back on Weldon; some suppose to attack Grant’s rear, but no doubt it is because he is pressed by Sherman with superior numbers.

A dispatch from Gen. Lee, to-day, states the important fact that Grant’s left wing (cavalry and infantry) passed Hatcher’s Run this morning, marching to Dinwiddie C. H. The purpose is to cut the South Side and Danville Roads; and it may be accomplished, for we have “here no adequate force of cavalry to oppose Sheridan; and it may be possible, if Sheridan turns his head this way, that shell may be thrown into the city. At all events, he may destroy some bridges—costing him dear.” But pontoon bridges were sent up the Danville Road yesterday and to-day, in anticipation, beyond the bridges to be destroyed.

March 30th.—Raining rapidly, and warm.

Again the sudden change of weather may be an interposition of Providence to defeat the effort of the enemy to destroy Gen. Lee’s communications with his Southern depots of supplies. I hope so, for faith in man is growing weaker.

Our loss in the affair of the 25th instant was heavy, and is now admitted to be a disaster; and Lee himself was there! It amounted, probably, to 3000 men. Grant says over 2000 prisoners were registered by his Provost Marshal. It is believed the President advised the desperate undertaking; be that as it may, many such blows cannot follow in quick succession without producing the most deplorable results. The government would soon make its escape—if it could. Mrs. Davis, however, soonest informed of our condition, got away in time.