Studies in the Out-Lying Fields of Psychic Science is a classic spiritual studies text by Hudson Tuttle. There is a Psychic Ether, related to thought, as the luminiferous ether is to light. This may be regarded as the thought atmosphere of the universe. A thinking being in this atmosphere is a pulsating center of thought-waves, as a luminous body is of light. There is a state of mind and body known as sensitive, or impressible, in which it receives...