To the disgrace of his species be it said, my boy, he referred to the spirited and fiery animal for which I am indebted to woman's generosity. I admit that when seen at a distance, the steed somewhat resembles an umbrella-stand; but a single look into his pearly eyes is enough to prove his relations with the animal kingdom. I have named him Pegasus, in honor of Tupper, and when I mount him, Villiam Brown, of Company 3, Regiment 5, Mackerel Brigade, says that I remind him of Santa Claus sitting astride the roof of a small gothic cottage, holding on by the chimney. Villiam is becoming rather too familiar, my boy, and I hope he'll be shot at an early day. Yesterday the army here was reënforced with a regiment of fat German cavalry from the West, under the command of Colonel Wobert Wobinson, who has had great experience in keeping a livery-stable. Their animals are well calculated to turn the point of a sword, and are of the high-backed fluted pattern, very glossy at the joints. I saw one of the dragoons cracking nuts on the backbone of the Arabian he rode, and asked him about how much such an animal was worth without the fur? He considered for a moment and then remarked that nix fustay and dampfnoodle, though many believed that swei glass und sweitzerkase; but upon the whole, it was nix cumarouse and apple-dumplings, notwithstanding the fact that yawpy, yawpy, betterish. Singular to relate, my boy, I had arrived at the very same conclusion before I asked him the question. Colonel Wobert Wobinson reviewed the regiment near Chain Bridge this morning, and each horse used about an acre to turn around in. Just before the order to "charge" was given, the orderly sergeant kindled a fire under each horse, and when the charge commenced, only about six of the animals laid down. Colonel Wobinson remarked that these six horses were in favor of peace, and refused to fight against their Southern brethren. I told him I thought that the peace breed had longer ears; and he said that that kind had been very scarce since the Government commenced appointing its foreign consuls. Yours, hoarsely, ORPHEUS C. KERR. LETTER XVII. NOTING A NEW VICTORY OF THE MACKEREL BRIGADE IN VIRGINIA, AND ILLUSTRATING THE PECULIAR THEOLOGY OF VILLIAM BROWN; WITH SOME MENTION OF THE SHARPSHOOTERS. WASHINGTON, D.C., October 18th, 1861.