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210 communicates its motion to all that is formed out of it and continued by it as your worlds are. Such motion is communicated in exact proportion to the vastly varied complexities of the matter of your worlds, and out of this proportionate communication arise the movements and the laws of movement of all the stars and planets, all of which movements and laws of movement are amenable to calculation. Much of this is already known to you, and the day will probably come when your men of science will be able to calculate the proper motion of the remotest star that your instruments can discover with as much precision as they now calculate the motions of your moon.

"Light is another link between your worlds and ours. And light is the one means which we have of detecting from our world the presence of yours. Not that we see light as you see it. The sort of perception that you have by means of light we have in our world by analogous but higher means. The presence of light is known to us when in our own world only by a slight shuddering motion of the ether. Just as you perceive a difference in the mode of motion when you travel on land and on the water or in the air; just so we perceive an analogous difference when we pass to the regions of light from the