General Bayard, the great cavalry chief of the Army of the Potomac during General Burnside's administration, made several efforts at consolidation, resulting, however, in no very permanent changes. It was reserved for General Hooker to bring about the desired result; and, at last, the Cavalry Corps of the Army of the Potomac is organized, with General George D. Stoneman for its commanding officer. By this change regiments which have been scattered here and there on detached service are brought together, and made to feel the enthusiasm which numbers generally inspire, especially when those numbers are united into a system, with a living head, whose intelligence and authority control the whole. Under this new _regime_ some very beneficial changes have been wrought. Schools or camps of instruction have been established, with a more rigid discipline than before, and boards of examination, with all the experience of the past before their eyes, have been organized. Old and incompetent officers have been dismissed, or have slunk away before this incisive catechism, giving way generally to intelligent, young, and efficient men, who, placed at the heads of regiments and brigades, give promise of success in the struggles that await us. The Rebel cavalry under Stuart has long been organized into an efficient body, which, at times, has sneered at our attempts to match them; and yet they have been made to feel, on some occasions, that we are a growing power, which time and experience may develop into something formidable. But the general successes of the Rebel army have made them all very insolent, in the hope that final victory is already in their grasp. _February 11._--My old friend and comrade, Sergeant Theodore May, of Pittstown, New York, died this afternoon at two o'clock, after a brief illness, of typhoid fever, which is a great scourge throughout the army. The death of this valiant fellow-soldier casts a deep gloom over the entire command, in which he has so faithfully served. When we entered the army together at the organization of the regiment, he came a perfect stranger, but his gentle manners and soldierly deportment soon made for him hosts of warm friends. By his gallantry on the field of battle, as well as by the gentleness of his manners and his unblemished conduct in camp, he has won the respect, and even admiration, of all who knew him.