Prehistory of Modern Otherkin?

I think I just found a reference to otherkin (of a sort) in a book published in 1907:

"Doubtless some of my readers have heard of some such persons who have studied 'occult science' and whose 'soul-mates' reside on Mars, Jupiter, or some other planet. I used to think that these people knew better; but I have met so many of them, that I have about concluded that they are deluded and actually believe in these 'soul-mates'. Sometimes these persons have considerable means, and pay the medium a goodly sum to materialize a particular 'soul-mate' for them."
Behind the Scenes with the Mediums By David Phelps Abbott

This is, essentially, hosting or channeling the residents of other worlds, as the modern otherkin community would understand it. The main difference is that most of the people in this quote seem to pay others to act as the medium, rather than being the medium themselves.

I'm going to be looking to see if other references to this (or similar phenomena related to otherkin) are made in the literature of the era.