FALMOUTH, VA., _opposite Fredericksburgh, December 21, 1862_.--Begin my visits among the camp hospitals in the army of the Potomac. Spend a good part of the day in a large brick mansion on the banks of the Rappahannock, used as a hospital since the battle--seems to have receiv'd only the worst cases. Out doors, at the foot of a tree, within ten yards of the front of the house, I notice a heap of amputated feet, legs, arms, hands, &c., a full load for a one-horse cart. Several dead bodies lie near, each cover'd with its brown woolen blanket. In the door-yard, towards the river, are fresh graves, mostly of officers, their names on pieces of arrel-staves or broken boards, stuck in the dirt. (Most of these bodies were subsequently taken up and transported north to their friends.) The large mansion is quite crowded upstairs and down, everything impromptu, no system, all bad enough, but I have no doubt the best that can be done; all the wounds pretty bad, some frightful, the men in their old clothes, unclean and bloody. Some of the wounded are rebel soldiers and officers, prisoners. One, a Mississippian, a captain, hit badly in leg, I talk'd with some time; he ask'd me for papers, which I gave him. (I saw him three months afterward in Washington, with his leg amputated, doing well.) I went through the rooms, downstairs and up. Some of the men were dying. I had nothing to give at that visit, but wrote a few letters to folks home, mothers, &c. Also talk'd to three or four, who seem'd most susceptible to it, and needing it. AFTER FIRST FREDERICKSBURG _December 23 to 31_.--The results of the late battle are exhibited everywhere about here in thousands of cases, (hundreds die every day,) in the camp, brigade, and division hospitals. These are merely tents, and sometimes very poor ones, the wounded lying on the ground, lucky if their blankets are spread on layers of pine or hemlock twigs, or small leaves. No cots; seldom even a mattress. It is pretty cold. The ground is frozen hard, and there is occasional snow. I go around from one case to another. I do not see that I do much good to these wounded and dying; but I cannot leave them. Once in a while some youngster holds on to me convulsively, and I do what I can for him; at any rate, stop with him and sit near him for hours, if he wishes it.