London: Methuen & Co. Ltd., [1937]. First edition, first impression. Offsetting to end papers, spine a bit faded (quite common with this book), a nearly fine copy in a very good dust jacket with wear to corner and spine ends, darkening to spine panel, closed tears at upper front flap fold and lower rear flap fold, two small closed tears at lower front panel, small triangular chip at upper right spine panel/upper left front corner, small chip at upper right rear corner/spine fold, two small chips to upper rear panel. (28416). Octavo, pp. [i-iv] v-ix [x] xi-xii 1-339 [340: printer's imprint], original blue cloth, spine panel stamped in red. 2513 copies of this issue were distributed. The author's fourth novel, often regarded as Stapledon's greatest work, and one of the very few truly seminal modern SF novels. "... mind-boggling imaginative tour de force..." - Survey of Science Fiction Literature V, pp. 2150-55. "... a tremendously exciting exposition of Stapledon's philosophy,…