table of twenty-five or fifty pounds or more requires a greater number of persons. But they will get no result if one at least among them is not gifted with the mediumistic power.

And let me add, on the other hand, that there is in such an experiment so great an expenditure of nervous and muscular energy that such an extraordinary medium as Eusapia, for instance, can obtain scarcely any results six hours, twelve hours, even twenty-four hours, after a séance in which she has so lavishly expended her psychic energy.

I will add that quite often the table continues to rise even after the experimenters have ceased to touch it. This is movement without contact.

This phenomenon of levitation is, to me, absolutely proved, although we cannot explain it. It is like what would happen if one had his hands gloved with loadstone, and, placing them on a table of iron, should lift it from the ground. But the action is not so simple as that: it is a case of psychic activity exterior to ourselves, momentarily in operation.[4]

Now how are these levitations and movements produced?

How is it that a stick of sealing-wax or a lamp-chimney, when rubbed, attracts bits of paper or elder pith?

How is it that a particle of iron grips so firmly to the loadstone when brought near it?

How is it that electricity accumulates in the vapor of water, in the molecules of a cloud, until it gives rise to the thunder, the thunderbolt, the lightning flash, and all their formidable results?

How is it that the thunderbolt strips the clothes from a man or a woman with its characteristic nonchalance?

And (to take a simple instance), without departing from our common and normal condition of life, how is it that we raise our arm?

2. Take now a specimen of another group of cases. The medium places one of her hands upon that of some person, and with the other beats the air, with one, two, three, or four strokes or raps. The raps are heard in the table, and you feel the vibrations at the same time that you hear them,—sharp blows which make you think of electric shocks. It is superfluous to state that the feet of the medium do not touch those of the table, but are kept at a distance from them.

The medium next places her hands with ours upon the table, and the taps heard in the table are stronger than in the preceding case.