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This volume contains matter which, if space had permitted, I should have included in Other Worlds than Ours,' partly in the way of introduction or explanation, and partly to complete the information contained in the several chapters. It will be under stood that to make this work complete/in itself, I have admitted certain passages which contain infor mation already given in Other Worlds than Ours but such passages amount in all but to some ten or twelve pages; the rest of the work is strictly supplementary to that volume.
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