draws them back again into their original form, and again throws them outward once more as the atoms of the fourth world—each atom containing this time 49^{3} bubbles. This process is repeated until the sixth of these successive impulses has built the atom of the seventh or the lowest world—that atom containing 49^{6} of the original bubbles.

This atom of the seventh world is the ultimate atom of the physical world—not any of the atoms of which chemists speak, but that ultimate out of which all their atoms are made. We have at this stage arrived at that condition of affairs in which the vast whirling sphere contains within itself seven types of matter, all one in essence, because all built of the same kind of bubbles, but differing in their degree of density. All these types are freely intermingled, so that specimens of each type would be found in a small portion of the sphere taken at random in any part of it, with, however, a general tendency of the heavier atoms to gravitate more and more towards the centre.

The seventh impulse sent out from the Third Aspect of the Deity does not, as before, draw back the physical atoms which were last made into the original dissociated bubbles, but draws them together into certain aggregations, thus making a number of different kinds of what may be called proto-elements, and these again are joined together into the various forms which are known to science as chemical elements. The making of these extends over a long period of ages, and they are made in a certain definite order by the interaction of several forces, as is correctly indicated in Sir William Crookes's paper, The Genesis of the Elements. Indeed the process of their making is not even now concluded; uranium is the latest and heaviest element so far as we know, but others still more complicated may perhaps be produced in the future.

As ages rolled on the condensation increased, and presently the stage of a vast glowing nebula was reached. As it cooled, still rapidly rotating, it flattened into a huge disc and gradually broke up into rings surrounding a central body—an arrangement not unlike that which Saturn exhibits at the present day, though on a far larger scale. As the time drew near when the planets would be required for the purposes of evolution, the Deity sets up somewhere in the thickness of each ring a subsidiary vortex into which a great deal of the matter of the ring was by degrees collected. The collisions of the gathered fragments caused a revival of the heat, and the resulting planet was for a long time a mass of glowing gas. Little by little it cooled once more, until it became fit to be the theatre of life such as ours. Thus were all the planets formed.

Almost all the matter of those interpenetrating worlds was by this time concentrated into the newly formed planets. Each of them was and is composed of all those different kinds of matter. The earth upon which we are now living is not merely a great ball of physical matter, built of the atoms of that lowest world, but has also attached to it an abundant supply of matter of the sixth, the fifth, the fourth and other worlds. It is well known to all students of science that particles of matter never actually touch one another, even in the hardest of substances. The spaces between them are always far greater in proportion than their own size—enormously greater. So there is ample room for all the other kinds of atoms of all those other worlds, not only to lie between the atoms of the denser matter, but to move quite freely among them and around them. Consequently, this globe upon which we live is not one world, but seven interpenetrating worlds, all occupying the same space, except that the finer types of matter extend further from the centre than does the denser matter.

We have given names to these interpenetrating worlds for convenience in speaking of them. No name is needed for the first, as man is not yet in direct connection with it; but when it is necessary to mention it, it may be called the divine world. The second is described as the monadic, because in it exist those Sparks of the divine Life which we call the human Monads; but neither of these can be touched by the highest clairvoyant investigations at present possible for us. The third sphere, whose atoms contain 2,401 bubbles, is called the spiritual world, because in it functions the highest Spirit in man as now constituted. The fourth is the intuitional world, [Previously called in Theosophical literature the buddhic plane.] because from it come the highest intuitions. The fifth is the mental world, because from its matter is built the mind of man. The sixth is called the emotional or astral world, because the emotions of man cause undulations in its matter. (The name astral was given to it by mediæval alchemists, because its matter is starry or shining as compared to that of the denser world.) The seventh world, composed of the type of matter which we see all around us, is called the physical.

The matter of which all these interpenetrating worlds are built is essentially the same matter, but differently arranged and of different degrees of density. Therefore the rates at which these various types of matter normally vibrate differ also. They may be considered as a vast gamut of undulations consisting of many octaves. The physical matter uses a certain number of the lowest of these octaves, the astral matter another group of octaves just above that, the mental matter a still further group, and so on.

Not only has each of these worlds its own type of matter; it has also its own set of aggregations of that matter—its own substances. In each world we arrange these substances in seven classes according to the rate at which their molecules vibrate. Usually, but not invariably, the slower oscillation involves also a larger molecule—a molecule, that is, built up by a special arrangement of the smaller molecules of the next higher subdivision. The application of heat increases the size of the molecules and also quickens and amplifies their undulation, so that they cover more ground, and the object, as a whole expands, until the point is reached where the aggregation of molecules breaks up, and the latter passes from one condition to that next above it. In the matter of the physical world the seven subdivisions are represented by seven degrees of density of matter, to which, beginning from below upwards, we give the names solid, liquid, gaseous, etheric, superetheric, subatomic and atomic.

The atomic subdivision is one in which all forms are built by the compression into certain shapes of the physical atoms, without any previous collection of these atoms into blocks or molecules. Typifying the physical ultimate atom for the moment by a brick, any form in the atomic subdivision would be made by gathering together some of the bricks, and building them into a certain shape. In order to make matter for the next lower subdivision, a certain number of the bricks (atoms) would first be gathered together and cemented into small blocks of say four bricks each, five bricks each, six bricks or seven bricks; and then these blocks so made would be used as building stones. For the next subdivision several of the blocks of the second subdivision cemented together in certain shapes would form building-stones, and so on to the lowest.

To transfer any substance from the solid condition to the liquid (that is to say, to melt it) is to increase the vibration of its compound molecules until at last they are shaken apart into the simpler molecules of which they were built. This process can in all cases be repeated again and again until finally any and every physical substance can be reduced to the ultimate atoms of the physical world.

Each of these worlds has its inhabitants, whose senses are normally capable of responding to the undulations of their own world only. A man living (as we are all doing) in the physical