By thus making intelligent use of our subjective mind, we, so to speak, create a _nucleus_, which is no sooner created than it begins to exercise an attractive force, drawing to itself material of a like character with its own, and if this process is allowed to go on undisturbed, it will continue until an external form corresponding to the nature of the nucleus comes out into manifestation on the plane of the objective and relative. This is the universal method of Nature on every plane. Some of the most advanced thinkers in modern physical science, in the endeavour to probe the great mystery of the first origin of the world, have postulated the formation of what they call "vortex rings" formed from an infinitely fine primordial substance. They tell us that if such a ring be once formed on the minutest scale and set rotating, then, since it would be moving in pure ether and subject to no friction, it must according to all known laws of physics be indestructible and its motion perpetual. Let two such rings approach each other, and by the law of attraction, they would coalesce into a whole, and so on until manifested matter as we apprehend it with our external senses, is at last formed. Of course no one has ever seen these rings with the physical eye. They are one of those abstractions which result if we follow out the observed law of physics and the unavoidable sequences of mathematics to their necessary consequences. We cannot account for the things that we _can_ see unless we assume the existence of other things which we _cannot_; and the "vortex theory" is one of these assumptions. This theory has not been put forward by mental scientists but by purely physical scientists as the ultimate conclusion to which their researches have led them, and this conclusion is that all the innumerable forms of Nature have their origin in the infinitely minute nucleus of the vortex ring, by whatever means the vortex ring may have received its initial impulse, a question with which physical science, as such, is not concerned.