Feb. 22 -- I must not let the great Hospital at the Patent Office pass away without some mention. A few weeks ago the vast area of the second story of that noblest of Washington buildings, was crowded close with rows of sick, badly wounded and dying soldiers. They were placed in three very large apartments. I went there many times. It was a strange, solemn and, with all its features of suffering and death, a sort of fascinating sight. I go sometimes at night to soothe and relieve particular cases. Two of the immense apartments are fill'd with high and ponderous glass cases, crowded with models in miniature of every kind of utensil, machine or invention, it ever enter'd into the mind of man to conceive; and with curiousities and foreign presents. Between thse cases are lateral openings, perhaps eight feet wide, and quite deep, and in these were placed the sick; besides a great long double row of them up and down through the middle of the hall. Many of them were very bad cases, wounds and amputations. Then there was a gallery running above the hall, in which there were beds also. It was, indeed, a curious scene at night, when lit up. The glass cases, the beds, the forms lying there, the gallery above, and the marble pavement under foot--the suffering, and the fortitude to bear it in various degrees--occasionally, from some, the groan that could not be repress'd--sometimes a poor fellow dying, with emaciated face and glassy eye, the nurse by his side, the doctor also there, but no friend, no relative--such were the sights but lately in the Patent Office. The wounded have since been removed from there, and it is now vacant again.