That book is quite unique, in that it isn't really, in the least new-agey...

It was first published in 1929 and is as much just a biographical, and very objectively formatted, I'd say, "account" of the author's own experimentation, as it is a kind of attempt at writing a sort of "manual" for projecting the old ka onto the "astral plane"...

...certainly I found it an interesting and entirely novel bit of reading...