Lewis commenced his well-regarded 'cosmic trilogy', or 'space trilogy', in 1938 with this title, and this is the reissue as a cheap edition using the original jacket clipped and repriced. It's assumed to have been issued in 1940 (Edwin Brown, In Pursuit of C. S. Lewis., Part 2, 35).
Jacket illustration by Harold Jones.
ReproJacket #206-A/Cheap-1, size 188.5x497mm.