Aye, 'tis a difficult thing to be a lady on a far world—but who needs them there? here are exceptions to almost every rule and Xenon was one of them. The rule in this particular case was the old cataloguers' adage that cataloguing duty was never pleasant, often dangerous and always hard. Xenon is the fourth planet of one of the stars investigated some seven or eight years ago by the battleship Terra on her swing around the edge of the Black Hole. Unequipped for exploration, the Terra hadn't both