Dr. Dagobert David Runes was the founder of The Philosophical Library, a spiritual organization and publisher. After receiving his Doctorate in Philosophy from the University of Vienna in 1924, he emigrated to the United States, where he became editor of The Modern Thinker and later Current Digest. From 1931 to 1934 he was Director of the Institute for Advanced Education in New York City.
I have an edition published in 1962, and mine was inexpensive, and I found it in a used bookstore seller. I have found this small volume immeasurably helpful in my philosophy readings. Do not underestimate this book. I would recommend it.