In neo-Theosophy, the etheric body, ether-body, or æther body is the subtle body propounded in esoteric philosophies as the first or lowest layer in the human energy field or aura. The etheric body is said to be in immediate contact with the physical body and to sustain it and connect it with "higher" bodies. It is also said to consist of a finer substance, more pure and composed of smaller particles, than the ordinary matter of the physical plane. (See the book Occult Chemistry by C.W. Leadbeater) The English term "etheric" in this context seems to derive from the Theosophical writings of Madame Blavatsky, but its use was formalised by C.W. Leadbeater and Annie Besant due to the elimination of Hindu terminology from the system of seven planes and bodies. (Adyar School of Theosophy). The term gained some general popularity after the 1914-1918 war, Walter John Kilner having adopted it for a layer of the "human atmosphere" which, as he claimed in a popular book, could be rendered visible to the naked eye by means of certain exercises. The classical element Aether of Platonic and Aristotlean physics continued in Victorian scientific proposals of a Luminiferous ether as well as the cognate chemical substance ether. According to Theosophists and Alice Bailey the etheric body inhabits an etheric plane which corresponds to the four higher subplanes of the physical plane. The intended reference is therefore to some extremely rarefied matter, analogous in usage to the word "spirit" (originally "breath"). In selecting it as the term for a clearly defined concept in an Indian-derived metaphysical system, the Theosophists aligned it with ideas such as the prana-maya-kosha (sheath made of prana, subtle breath or life-force) of Vedantic thought. In popular use it is often confounded with the related concept of the astral body as for example in the term astral projection - the early Theosophists had called it the "astral double". Others prefer to speak of the "lower and higher astral". Accounts Linga sarira is a Sanskrit term for the invisible double of the human body, the etheric body or etheric double (or astral body in some Theosophical concepts). It is one of the seven principles of the human being, according to Theosophical philosophy. Rudolf Steiner, the founder of Anthroposophy, often referred to the etheric body (Ätherleib or "Life Body") in association with the etheric formative forces and the evolution of man and the