Recently, Google Books put up C.T. Russell's WHAT SAY THE SCRIPTURES ABOUT SPIRITUALISM? PROOFS THAT IT IS DEMONISM. - ALSO- Who are "The Spirits In Prison?" ; And, Why are They There?
It was published in 1897.
If I've got this right, it can be found at the following link. It was digitized just this last May.
http://books.google.com/books?id=Oeg0AAAAMAAJ&dq
If that doesn't work for you, you can download a copy at this filesharing site:
http://www.filesend.net/download.php?f=7f31bd90688e3b9502ab138e193aa520
Interestingly, Russell held that some of the fallen angels could be saved. He discusses this on pp 113-119. I think this helps explain some of the reason he liked the message in Seola and why the Bible Students distributed the book Angels and Women.