For their knowledge of the constitution of the universe the discovery of these two forms of radiant energy proved to be of great importance. They were able to find out the relationships of gravitation, electricity, the dark rays of the inamar, the negative rays of the lavolan, light, heat, and the two new types of energy. And by means of the similarities and differences found to exist between any two of them they were enabled to resolve the molecules of any element into their constituent atoms, and thus to reveal the characteristics of the fundamental ether. They felt that they were at last in the immediate presence of the medium which filled space, and they invented an apparatus isolating the ether from all the forms it enters into, so that it became manifest under their magnifiers to several of their senses. In it they were able to make any one of the forms of energy move and play. From it they were able to mould many of the terrene forms of latent energy, and they hoped to mould most of the others with which they were familiar. One of the most immediately practical results that came from the discovery of these two modes of energy was another kind of engine, which almost doubled their store of force in Rimla. The main form of it took advantage of the radiant energy that showed indifference or obedience to gravitation according as it played in a vacuum or through an alloy of irelium into the air. The new rays lifted a piston _in vacuo_, and by an automatic arrangement they passed through a film of the alloy and then allowed gravitation to pull them and the piston with them back into its first position; the rapid alternations drove magnetic machinery which produced and stored up electricity. Another form of the new engine used the difference between the conduct the other newly discovered radiant energy displayed towards magnets when it played in a vacuum vessel of irelium, and when it had issued through the vessel’s filmy side.