"I hate to think of what will happen to those in the cavern," replied Correy, smiling grimly. "Or rather, since you've told me of the pleasant little death they had arranged for us. I'm mighty glad of it. They'll receive rough treatment, I'm afraid!" "They deserve it. It has been a great sight to watch, but I believe we've seen enough. It has been a good night's work, but it's daylight, now, and it will take hours to repair the damage to the _Ertak's_ hull. Take over in the navigating room, if you will, and pick a likely spot where we will not be disturbed. We should be on our course by to-night, Mr. Correy." "Right, sir," said Correy, with a last wondering look at the strange miracle we had brought to pass on the earth below us. "It will seem good to be off in space again, away from the troubles of these little worlds." "There are troubles in space, too," I said dryly, thinking of the swarm of meteorites that had come so close to wiping the _Ertak_ off the records of the Service. "You can't escape trouble even in space." "No, sir," said Correy from the doorway. "But you can get your sleep regularly!" And sleep is, when one comes to think of it, a very precious thing. Particularly for an old man, whose eyelids are heavy with years. Readers' Corner [Illustration: Readers' Corner] _Now In Book Form_ Readers of Astounding Stories will be interested to hear that two of the continued novels which appeared in our pages during last year are coming out in book form. The first of these is "Murder Madness," by Murray Leinster. It is due sometime in February, so by the time this issue is on the newsstands it will no doubt be already out. The publishers are Brewer and Warren, and the price is $2.00. Here's your chance, collectors, and those who missed an instalment or two. The other book is "Brigands of the Moon," by--everyone knows--Ray Cummings. It should be coming along in a month or so. Watch out for it! _Mr. Cummings Sits In_ Dear Editor: Thank you for the opportunity to address our Readers on certain side-lights of my tale, "The Exile of Time." I particularly welcome it, for the theme of Time-traveling is, I think, the most interesting of any upon which I have written. Some of you will no doubt recall my stories "The Man Who Mastered Time" and "The Shadow Girl." In "The Exile of Time," I present the third of the trilogy. It has no fictional connection with the others; it is in no sense a sequel, but rather a companion story. To write about Time-traveling is for me a difficult but fascinating task. The opportunities are endless; and I hope you may think I have taken advantage of them with a measure of success.