Evening is the time for talk around the camp fires; and the conversation often turns upon our rebellious brethren. Among our regular officers you meet the classmates and old companions in arms of the rebels, and hear of little traits and peculiarities that only intimate acquaintances can relate. Civilians who had known General Lee at Washington, have spoken of him as very formal, and rather pompous in his manner, giving the impression that he was a man of more show and pretence than abilities. We learned here, however, that, in Texas, or California, where he was for a long time before he took his high position on Scott's staff, he was famous for marching his men without the usual encumbrances of baggage, on the most severe expeditions against the Indians, in the snow and cold of the winter. Stonewall Jackson has always been famed for his peculiarities. When a young man, he was possessed with the idea that he was in danger of having his limbs paralyzed, and he would pump on his arm for many minutes, counting the strokes, and annoyed beyond measure by the interruptions of his companions breaking up his count. Our officers, both regular and volunteer, who have been in actual battle, have a great respect for the rebel leaders and soldiers; they speak very highly of their drill, and believe that straggling exists to a less extent among them, in battle, than with us. From the rebel newspapers I should doubt whether this is the case. One thing we have not considered, which has given the rebels a great advantage in this contest. It is the large number of military colleges in the South; not like our few private schools at the North, but well-endowed academies. In the summer of 1860, immediately before the election of Lincoln, I visited the military academy at Lexington, Virginia. It was supported at the expense of the State, with two hundred and more pupils, coming from the different counties in proportion to their population. They were practised in the actual firing of cannon and mortars; and every afternoon were drilled as infantry for about two hours, much of the time at the double quick. The principal was a graduate of West Point; and he was assisted by a respectable board of instructors. A good civil and military education, after the mode of instruction at West Point, was afforded to the students. This institution had been in existence for years; and one can readily appreciate the advantage that Virginia has in this war from the graduates of this school. Alabama and several other of the Southern States have similar colleges; while we at the North have been obliged to educate all our volunteer officers by actual service.