Of medium height, slight and trim of figure, clear complexion and piercing gray eyes of peculiar brilliancy, softened by a merry twinkle betokening latent mischief, young Perkins was a youth fair and interesting to look upon. He walked with quick, elastic step, carried his head a little on one side, and had a habit, when anything struck his fancy pleasantly, of shrugging his shoulders and rubbing his hands together in a vigorous way, that seemed to declare in unmistakable terms that he was glad all over! During one of the wonted summer cruises, he made himself somewhat famous at great-gun practice, the details of which are given in one of his home letters, as follows:-- "We had target practice one day, and it came my turn to shoot. There was quite a swell on, which made it very difficult to get any kind of a shot, but when I fired I hit the target, which was a barrel with a small flag on it, set up about three quarters of a mile distant. Such a thing as hitting a small target at sea, with the ship in motion, and a swell on, is considered almost out of the question, so they all said it was 'luck.' But another target was put out, and I fired again and stove it all to pieces. Then the crew all cheered, and made quite a hero of me. Still some said it must be luck, and another target was put out in exactly the same manner. This one I did not quite hit, but the shot fell so near, that all gave it up it was _not_ luck, and that I was a first-rate shot with broadside guns." After such demonstration, it is not strange that he was looked upon as having a very correct eye for distances, and was ever afterward called upon to fire whenever experiments were wanted. Naval gunnery, be it remarked in passing, is quite a different matter from army practice: in the former, with its platform never at rest, it is like shooting a bird on the wing, when distance and motion must be accurately gauged and allowed for; in the latter, from its gun on a fixed platform, it is but a question of measurement from the object, by means of instruments if need be, and of good pointing. The seaman stands immediately in rear of the gun, with eye along the sight directing its train, now right, now left, now well, and with taut lock-string in hand in readiness to pull the moment the object is on, and on the alert to jump clear of the recoil. The soldier handles his piece with greater deliberation, sights it leisurely on its immovable platform, and, if mounted _en barbette_, retires behind a traverse before firing. Graduating in June, 1856, the now full-fledged Midshipman Perkins could look back upon his five years' probationary experience with many pleasant recollections, though doubtless thanking his stars that his pupilage was over.