G. R. S. Mead 
Fragments of a Faith Forgotten [PDF ebook] 
Some Short Sketches Among the Gnostics Mainly of the First Two Centuries A Contribution to the Study of Christian Origins Based on the Most Recently Recovered Materials

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The second edition is practically a reprint of the first. I have removed or altered a few words and phrases, have added the newest-found Oxyrhynchus logoi, endeavoured to bring the bibliography up-to-date, and appended an index.