Braunschweig: Friedr. Vieweg & Sohn 1920. IV, 83 pages. 8vo. Tan wrappers printed in red and black. Stain to lower extremities first and last few pages. Minor wear overall. Uniform browning of the pages as normal. Good. Wraps. 
First published in 1917 and 70 pages, this work went through many printings and editions very quickly. It was first published in English in 1920. Here we offer the sixth edition in the original German from 1920. "Sechste Auflage. (15.-18. Tausend)"
The English preface notes: "THE PRESENT book is intended, as far as possible, to give an exact insight into the theory of Relativity to those readers who, from a general scientific and philosophical point of view, are interested in the theory, but who are not conversant with the mathematical apparatus 1 of theoretical physics. The work presumes a standard of education corresponding to that of a university matriculation examination, and, despite the shortness of the book, a fair amount of patience and force of will on the part of the reader. The author has spared himself no pains in his endeavour to present the main ideas in the simplest and most intelligible form, and on the whole, in the sequence and connection in which they actually originated. In the interest of clearness, it appeared to me inevitable that I should repeat myself frequently, without paying the slightest attention to the elegance of the presentation."