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.
If that doesn't work for you, you can download a copy at this filesharing site:
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.