Mr. Kennedy is a man of apparently 30 years of age, with an exceedingly unprepossessing countenance. His head is well shaped, but his brow is lowering, his eyes deep sunken and his look unsteady. Evidently a keen-witted, desperate man, he combines the cunning and the enthusiasm of a fanatic, with the lack of moral principle characteristic of many Southern Hotspurs, whose former college experiences, and most recent hotel-burning plots are somewhat familiar to our readers. Kennedy is well connected at the South, is a relative, a nephew we believe, of Howell Cobb, and was educated at the expense of the United States, at West Point, where he remained two years, leaving at that partial period of study in consequence of mental or physical inability. While there he made the acquaintance of Ex. Brig. Gen. E.W. Stoughton, who courteously proffered his services as counsel for his ancient friend in his present needy hour. During Kennedy’s confinement here, while awaiting trial, he made sundry foolish admissions, wrote several letters which have told against him, and in general did, either intentionally or indiscreetly, many things, which seem to have rendered his conviction almost a matter of entire certainty.