Spiritualism: As Spiritualists Have Written of – Herbert V. O'Neill

Published in 1947 this book discusses spiritualism and the theories around it. 

From the book "NEARLY sixty years have elapsed since the Society for Psychical Research was founded, for the purpose, as it stated in its first manifesto, of making an organized and systematic attempt to investigate that large group of debatable phenomena designated by such terms as “ mesmeric,” “ psychical,” and “ spiritualistic".' Amongst its first investigators were Mr. Hereward Carrington, Mr. Baggally and the Hon. Everard Feilding.

After years of patient and careful investigation the verdict of all three was unanimous as to the high percentage of psychic phenomena' produced by fraud and trickery. Mr. Carrington in his Personal Experiences in Spiritualism placed the percentage at 98, and no one suspects him of overstatement."