The slate-writing, for the production of which under test conditifins some ^f the greatest mediums have been so famous, fs sometimes produced by precipitation, though more frequently the fragment of pencil enclosed between the slates is guided by a spirit hand, of which only just the tiny points sufficient to grasp it are materialized. An occurrence which occasionally takes place at stances, and more frequently among Eastern Ydgis, is Levitation what is called levitation—that is, the floating ev ' a '° n ' of a human body in the air. No doubt when this takes place in the case of a medium, he is often simply upborne by"spirit hands,” but there is another and more scientific method of accomplishing this feat which is always used in the East, and occasionally here also. Occult science is • acquainted with a means of neutralizing or even entirely reversing the attraction of gravity, and it is obvious that by the judicious use of this power all the phenomena of levitation may be easily produced. It was no doubt by a knowledge of this secret that some of the air-ships of ancient India and Atlantis were raised from the earth and made light enough to be readily moved and directed ; and not improbably the same acquaintance with nature's finer forces greatly facilitated the labours of those who raised the