FIRST EDITION of a seminal work from 1920, which examines the effect of the theory of relativity on Kant`s notion of synthetic a priori. The author, Hans Reichenbach, was a philosopher of science and founder of the Society for Empirical Philosophy ("The Berlin Circle"). This work was written after attending numerous lectures on relativity given by Albert Einstein. 140x220mm. 110 pages. Softcover. Cover and pages slightly curved. Cover browning and slightly stained. Ink writing on front cover. Cover edges and corners worn. Cover upper edge and corner peeling. Spine mostly missing. Spine front hinge cracked. Few pencil underlining on several first pages. Pages yellowing and rough-cut (as published). Most pages uncut. [SUMMARY]: Save for some external wear, this rare first edition of an influential scientific work is in good condition.