THE TEACHINGS and findings of Natural Science are embodied in six volumes, and
Courses of Instruction supplementary thereto:

In volume one is defined the Universal Principle of Polarity which operates throughout the four distinct kingdoms of Nature, mineral, vegetable, animal and human; and the Constructive Process of Evolution in operation, on both the physical and spiritual planes of Matter, Life and  Intelligence.

In volume two is described why and how those who seek through hypnotic and mediumistic methods, to prove the fact of life after physical death, fail to accomplish that result scientifically, and therefore fail to obtain the satisfaction they seek; that hypnotism and mediumship are
but different expressions or manifestations of the same Destructive Principle of Nature and Individual Life.

In volume three is explained how one must live and what he must do to enable him to demonstrate the fact of another life constructively; and that any Individual who has the Intelligence to know, the Courage to dare and the Perseverance to do, may accomplish the Great
Work of Self-Development and Self-Completion; and how he may "live the life" on this earth plane in such manner as to derive the greatest benefit, and thereby fulfill the purpose of his earthly existence.

In volume four is embodied a comprehensive explanation of conditions upon the spiritual planes of life; that they are as natural—as much a part of Nature— as the physical world; that it is neither an UN-natural nor a SUPER-natural condition, but literally as natural as the physical life; and that the spiritual planes are inhabited by people just as natural as those upon the earth plane.

In volume five is reviewed the great constructive Movements of the past and their contribution to the advancement and betterment of the human race. This is the Lineal Key which traces the golden thread of teachings and unites them in a continuous line of effort for the emancipation and evolution of humanity.
In Self-Unfoldment is reviewed the practical application of Moral Principles to the Living of a Life.

The Textbooks are based upon the accumulated knowledge and wisdom of those great Intelligences who have made these subjects a special study throughout many years.