51 between the Desire World and the World of Thought, whether involuntarily, in the course of an ordinary cyclic pilgrimage of the soul, which we shall later elucidate when speaking of the post-mortem existence, or by an act of the will, as in the case of the trained occult investigator, all have the same experience in transition. There are two main divisions in the Physical World: the Chemical Region and the Etheric Region. The World of Thought also has two great subdivisions: The Region of concrete Thought and the Region of abstract Thought. As we specialize the material of the Physical World and shape into a dense body, and as we form the force-matter of the Desire World into a desire body, so do we appropriate a certain amount of mindstuff from the Region of concrete Thought; but we, as spirits, clothe ourselves in spirit-substance from the Region of abstract Thought and thereby we become individual, separate Egos. The Region of Concrete Thought. The Region of concrete Thought is neither shadowy nor illusory. It is the acme of reality and this world which we mistakenly regard as the only verity, is but an evanescent replica of that Region. A little reflection will show the reasonableness of this statement and prove our contention that all we see here is really crystallized thought. Our houses, our machinery, our chairs and tables, all that has been made by the hand of man is the embodiment of a thought. As the juices in the soft body of the snail gradually crystallize into the hard and flinty shell which it carries upon its back and which hides it, so everything used in our civilization is a concretion of invisible, intangible mind-stuff. The thought of James Watt in time congealed into a steam engine and revolutionized the world. Edison's thought was condensed into an electric generator which has turned night to [097]