In fact, it is evident to those who have taken the trouble to investigate the question seriously, and who do not dismiss it with an _a priori_ decision, that in addition to the fraudulent mediums who make it their business to trick the public, and are ready to produce a new marvel for every new dollar, and to call "spirits from the vasty deep" of the unseen universe in form and shape to suit every customer, there are some private and strictly honest mediums, and many phenomena which no theory of conjuring will explain. To what they are due is another question, in regard to which no hypothesis is here offered. It may be said here, however, that the work of the Psychic Research Society has demonstrated rather conclusively that certain hitherto unknown and unsuspected powers and laws of nature do exist, and that man's five senses are not the only means by which he gains a knowledge of what is going on in other minds than his own. The facts of thought-transference, of mesmeric control, of apparitions of the living, and the like, as critically tested by the members of this society, seem to indicate clearly that mind can affect, influence, and control mind through some other channel than that of the senses, usually over short distances, but in case of strong mental concentration over long distances. That some psychic medium, some ethereal atmosphere, infiltrates our grosser atmosphere, and is capable of conveying waves of thought as the luminiferous ether conveys waves of light, is the theory advanced in explanation of these phenomena. Spiritualists had long before advanced a like theory in explanation of their phenomena, claiming that disembodied as well as living minds have the power of influencing and controlling other minds, through the agency of such a psychic atmosphere, and also of acting upon and moving physical substances through a like agency. As to the probability of all this, no opinion is here offered. It is our purpose simply to select some of the more striking instances of spiritualistic phenomena, as recorded by scientific observers. Those placed on record by the numerous unscientific and unknown investigators are not the kind of material to present to the general public. Statements of an unusual character need to be thoroughly substantiated before they can be accepted, and the remarkable phenomena adduced as spiritual demand evidence of the most unquestionable character. There is always the feeling that the observer may have been deceived by some shrewd trickery, or have credulously accepted what others would have readily seen through, or that the senses may have been under some form of mesmeric control. Instances of such phenomena, therefore, need to be attested by the names of persons of well-known honesty, judgment, and discrimination, and attended with an exact statement of the tests applied, before they can be accepted as thoroughly trustworthy accounts. Some instances of this character may be here given.