Davis, in his Great Harmonia, page 206, exposes a class of "mercenary practitioners, who claim extraordinary or supernatural powers for their subjects, _who give public and vulgar exhibitions, who employ chicanery and ignorant plans, who trifle with and play fantastic tricks with their subjects_." He speaks of a class of "doctrinal practitioners, who prevert and misinterpret principles and results; who labor to make the phenomena subservient to, and illustrative of, the theological dogmas; who receive, modify, or reject, as a sectarian education and prejudice may sanction; who conceal, misstate, and magnify disclosures." Enough, in all conscience, to condemn the whole farce. MYSTERIOUS PHENOMENA, WITH THEIR AGENTS OR CAUSES. A work has recently been issued in Boston, by E. C. Rogers, containing an exposition of mysterious agents, and dynamic laws, or science of moving powers. It is a very valuable work, and, with his consent, we shall take the liberty of introducing some of the principal facts adduced; and at the same time would advise every inquirer to purchase the work for himself, which he will never have cause to regret. On page 22, the author says, "Light and heat have always been known as agents by the common sensation of their more palpable phenomena. But electricity and magnetism were not known until their phenomena were specially observed. Many of the facts of these agents, before the latter had become known, were referred to spiritual agencies. It is the tendency of ignorance, in every age, to do the same thing. Reason demands an agent adequate to the production of every phenomenon. If she has not been furnished with sufficient data by which to arrive at a correct conclusion, imagination, influenced by a blind marvellousness, will refer the phenomena to some supernatural cause. Hence the early superstitions about chemical operations, the appearance of comets, eclipses, meteors, the 'bog lights,' and a thousand other phenomena. But as the agencies of nature have become known, and their laws and conditions of action discovered, the domination of superstition has given place to the triumph of reason and the reign of truth."