About magic and occultism. Criteria for the reliability of supersensible experience

The following work is intended to cover such extremely interesting topics as thought transmission, mental telepathy, clairvoyance (natural and induced), psychometry, hypnosis, prophetic dreams and communication with the spirits of the dead through mediums - spiritualism. All this is intended... to give us valuable information about the activities of the human soul.
“I have written this book not to incite my readers against spiritualism, but to encourage them to reason in inquiry. It is necessary to analyze the evidence and “not judge by clothes, but make a righteous verdict.” It is not my intention to deal with the history, ethics, or even the phenomena of spiritualism. Others have done this well before me. I write simply to show that there is “something” in spiritualism: it is so important that, on the one hand, it cannot be lightly dismissed, and on the other, its phenomena should not always be attributed to the action of disembodied spirits.”
The book also contains the author's works on the contemplation of crystals and the making of a magic mirror, which he refers to in his work on supersensible experience.