RARE book from the second decade of the 20th century, in which the renowned physicist Albert Einstein attempts to make the special and general theories of relativity accessible to a wide audience, explaining the scientific and philosophical principles underlying the theory, without providing the mathematical basis. The book features several figures and formulas. 225x140mm. 83 pages. Softcover. Cover worn and browning. Cover edges and corners partly missing. Front cover detached. Rear cover upper corner missing. Pencil side notes and underlining on some pages. Pages 3-14 coming loose from binding. Some pages uncut. Page edges rough-cut as published. Pages slightly yellowing. [SUMMARY]: Despite the wear it has sustained, this rare classic monograph in modern physics by the celebrated Nobel-prize winning scientist is in good reading condition.