PROFESSOR (rising and addressing the FAT LADY--then reseating himself). Ladies and gentlemen! The phenomenon we are investigating to-night is regarded, on the one hand, as something new; and, on the other, as something transcending the limits of natural conditions. Neither view is correct. This phenomenon is not new but is as old as the world; and it is not supernatural but is subject to the eternal laws that govern all that exists. This phenomenon has been usually defined as "intercourse with the spirit world." That definition is inexact. Under such a definition the spirit world is contrasted with the material world. But this is erroneous; there is no such contrast! Both worlds are so closely connected that it is impossible to draw a line of demarcation, separating the one from the other. We say matter is composed of molecules.... PETRISTCHEF. Prosy matter! [Whispering and laughter. PROFESSOR (pauses, then continues). Molecules are composed of atoms, but the atoms, having no extension, are in reality nothing but the points of application of forces. Strictly speaking, not of forces but of energy, that same energy which is as much a unity and just as indestructible as matter. But matter, though one, has many different aspects, and the same is true of energy. Till recently only four forms of energy, convertible into one another, have been known to us: energies known as the dynamic, the thermal, the electric, and the chemic. But these four aspects of energy are far from exhausting all the varieties of its manifestation. The forms in which energy may manifest itself are very diverse, and it is one of these new and as yet but little known phases of energy, that we are investigating to-night. I refer to mediumistic energy. [Renewed whispering and laughter among the young people. PROFESSOR (stops and casts a severe look round). Mediumistic energy has been known to mankind for ages: prophecy, presentiments, visions and so on, are nothing but manifestations of mediumistic energy. The manifestations produced by it have, I say, been known to mankind for ages. But the energy itself has not been recognised as such till quite recently--not till that medium, the vibrations of which cause the manifestations of mediumistic energy, was recognised. In the same way that the phenomena of light were inexplicable until the existence of an imponderable substance--an ether--was recognised, so mediumistic phenomena seemed mysterious until the now fully established fact was recognised, that between the particles of ether there exists another still more rarefied imponderable substance not subject to the law of the three dimensions.... [Renewed laughter, whispers, and giggling.