Of clairvoyance, mind-reading, palmistry, spiritual science cures we have no certain facts, but we have many impostures connected with them. If ever we get real and undoubted facts proved to be connected with them, we ought to examine them with care. Science is not afraid of any portion of nature; all it dreads is ignorance, and what is worse, error. Error with regard to facts may be committed in two ways--by admitting as facts what are not facts, and by denying facts. Now, there are facts certain and well ascertained, numerous and widely known, connected with some other portions of the border-land of science that we have not yet looked into, though I have mentioned their names. He who would assert that spiritism, table-turning, spirit-rapping, and so on are mere idle talk, sheer impostures, is not well read in the literature of the present day. By denying all reality to these phenomena he strays as far from the truth as if he allowed himself to believe mere fabrications. They are not impositions, but they are worse; they are superstitions. By superstitions I mean here the practice of producing results which cannot possibly proceed from the powers of nature, and which could not without absurdity be attributed to the interference of the Creator or His good angels. Some persons strenuously object to introducing any reference to God into scientific works. Science consists in tracing known effects to their true causes. If there were no God, He could not be a true cause and it would be unscientific to introduce His agency. But if there is a God and He acts in the world which He has made, we must take His actions into account when we study His works. Some say, "I do not believe in a God." That may be, but that does not prove that there is no God. Belief is a man's wilful and fine acceptance of what is proposed to him on the authority of some one else. Students have most of their knowledge on the authority of their professors and other men of learning. If a medical student would say, "I do not believe in microbes nor in contagion by disease germs," that would not kill the germs nor protect him against contagion. Nor would it show his superior wisdom, but rather his extravagant conceit and ignorance. So with those who believe not in God.