by G.R.S. Mead
This is one of the best books about the Gnostics written prior to the Nag Hammadi discoveries. G.R.S. Mead, who also translated the Pistis Sophia, summarizes what was known about the Gnostics at the turn of the 20th century. At that time, a better picture of the Gnostics was emerging, based on several papyri which had been recently discovered. Although there had been a lot of academic research on this subject, most of the key works were in German or French. Therefore this book and The Gnostics and Their Remains are the only two major books in English on this subject currently in the public domain...