INTRODUCTION.
The Diverse Theories pertaining to these Phenomena, and the Methods of Inquiry, and Laws of Evidence, by which any one of them can be Verified (The Humbug Theory, The Satanic Agency Theory, The Spiritualistic Theory, The Mundane Theory); The Affirmed Visible, Tangible, and Audible Manifestations of Spiritualism; Photography and Spiritualism; Levitation; Concluding Remarks, and Plan of the Treatise.

1. ELECTRICITY, MAGNETISM, AND ANIMAL MAGNETISM DISTINGUISHED.
Effects of Animal Magnetism upon the Human System.

2. THE ODYLIC, ODIC, OR PSYCHIC FORCE.
Physical Manifestations; The Odylic Force identical with that which is the immediate cause of the Spirit-Manifestations; The immediate cause of these Manifestations identical with that from which result all the Phenomena of, Mesmerism and Clairvoyance.

3. PHYSICAL AND INTELLECTUAL MANIFESTATIONS ELUCIDATED.
The Exclusively Physical Phenomena; Affirmed Intellectual Communications; The Three Classes of Mediums; A Large and Essential Portion of these Affirmed Spirit-Communications have an Exclusively Mundane Origin.

4. POSITIVE AND CONCLUSIVE PROOF THAT ALL THESE COMMUNICATIONS AND MANIFESTATIONS ARE THE EXCLUSIVE RESULT OF MUNDANE CAUSES, AND NOT OF THE AGENCY OF DISEMBODIED SPIRITS.
The Admitted Fact, that an Essential Part of these Phenomena are Undeniably Originated by Exclusively Mundane Causes, Requires, without absolute proof to the contrary, that they all to be Referred to the same Causes; No New, and none but Exclusively Mundane, Truths are Represented in these Communications; All these Communications take Specific Form from the Known Sentiments in the Particular Circles in which said Communications Originate; Known Exceptions Confirm the Deductions under Consideration; The Character of the Affirmed Spirit-thoughts, as Contrasted with the Known Life-thoughts of Individuals, Evince the former as having none but a Mundane Origin; Revelations which do not, as Contrasted with those which do, Originate in these Circles, Confirm the same Conclusion; The General Intellectual Character of these Communications Demonstrate their Non-Spirit Origin; Fundamental Facts Developed by Individuals through Inquiries made for self-satisfaction in regard to the Origin and Cause of these Phenomena, Individuals who had Formed no Definite Theory upon the Subject The same Responses and the same Evidence of Spirit presence, can be Obtained from the Spirits of Individuals yet alive, but supposed to be dead, as from the Spirits of Persons actually dead; Similar Responses are Obtained in these Circles, by devoted Spiritualists, from the spirits of persons actually alive, but supposed to be dead; Most Decisive Observations and Experiments made by Individuals of the highest intelligence and integrity, for the specific purpose of Determining the Nature and Location of the Cause of these Phenomena (Very Interesting and Decisive Facts furnished by one of our former Pupils; Facts which occurred at the house of the Rev. Starr King; Important Facts furnished by Dr. Bell; The Statements of Dr. Bell confirmed by kindred ones from N. I. Bowditch, Esq.; Important Facts furnished by a New England Congregationial Clergyman; Interesting and Illustrative Facts furnished by a Pastor of one of the Churches in the City of Cleveland, Ohio); A Peculiar Class of False Answers continually Obtained in these Circles Evince the Exclusively Mundane Origin of these Phenomena; Enquiries made for the Specific purpose of Determining, not only the Location of the Controlling Cause of these Phenomena, but of the Extent of the Control which could be Exercised over these Phenomena; Important Evidence Obtained from the Observations and Testimony of Individuals who have themselves been Mediums; Disagreements and Contradictions in these Communications Incompatible with the idea of their Extra-mundane Origin; False Communications which can be accounted for but upon the Mundane Hypothesis.

5. TENDENCY OF SPIRITUALISM.
Section I. Tendency of Spiritualism to the Good or ill of Mankind Physically; Section II. Tendency of Spiritualism to Benefit or Injure Mankind Intellectually (Spiritualism not a Reliable Source of Information; Spiritualism has not Benefited the World, as far as Science is Concerned; Spiritualism itself utterly wanting in all the Characteristics of a truly Scientific Movement, Spiritualism has done nothing to Improve the Literature of Humanity); Section III. Moral Tendency of Spiritualism (Summary Statement of the Tendencies of Spiritualism).

6. MISCELLANEOUS TOPICS.
Section I. Special Facts connected with Spiritualism (Copying the Voice, Manner, and Handwriting of Individuals, Tactual Impressions, Seeing Spirits); Section II. Phenomena of Dreaming, and Premonitions of Future Events (Analogous Facts of Common Occurrence in Every-day Life); Section III. Phenomena of Ghost-seeing and Haunted Houses; Section IV. Witchcraft, Fortune-Telling, Manner in which Mysterious Events are Commonly Treated; Section V. These so-called Spirit-Manifestations and Scripture Miracles, Bearing of our previous Discussions upon the Doctrine of a General and Particular Providence, Conclusion.