But the term "astral light," while not new, is purely of Occidental origin. Porphyry spoke of it when referring to the celestial or soul-body, which he says is immortal, luminous, and "star-like;" Paracelsus called it the "sidereal light;" later it grew to be known as astral. It was said to be the same as the _anima mundi_ or soul of the world. Modern scientific investigators approach it when they speak of "luminiferous ether" and "radiant matter." The great astronomer, Camille Flammarion, who was a member of the Theosophical Society during his life, speaks of the astral light in his novel _Uranie_ and says: "The light emanating from all these suns that people immensity, the light reflected through space by all these worlds lighted by these suns, _photographs_ throughout the boundless heaven the centuries, the days, the moments as they pass.... From this it results that the histories of all the worlds are travelling through space without dispersing altogether, and that all the events of the past are present and live evermore in the bosom of the infinite." Like all unfamiliar or occult things the astral light is difficult to define, and especially so from the very fact that it is called "light." It is not the light as we know it, and neither is it darkness. Perhaps it was said to be a light because when clairvoyants saw by means of it, the distant objects seemed to be illuminated. But as equally well distant sounds can be heard in it, heavy bodies levitated by it, odors carried thousands of miles through it, thoughts read in it, and all the various phenomena by mediums brought about under its action, there has been a use of the term "light" which while unavoidable is none the less erroneous. A definition to be accurate must include all the functions and powers of this light, but as those are not fully known even to the mystic, and wholly _terra incognita_ for the scientist, we must be content with a partial analysis. It is a substance easily imagined as imponderable ether which, emanating from the stars, envelopes the earth and permeates every atom of the globe and each molecule upon it. Obeying the laws of attraction and repulsion, it vibrates to and fro, making itself now positive and now negative. This gives it a circular motion which is symbolized by the serpent. It is the great final agent, or prime mover, cosmically speaking, which not only makes the plant grow but also keeps up the diastole and systole of the human heart. Very like the action of the sensitive photographic plate is this light. It takes, as Flammarion says, the pictures of every moment and holds them in its grasp. For this reason the Egyptians knew it as the Recorder; it is the Recording Angel of the Christian, and in one aspect it is Yâma, the judge of the dead in the Hindû pantheon, for it is by the pictures we impress therein that we are judged by Karma.