There is a fascination in the attempt to define the supernatural, although one is aware of the etymological contradiction implied in the effort. The definition of the Century Dictionary, “that which is above or beyond the established course or laws of nature,” does not help us much. This definition is best approached by drawing a distinction between the natural and the supernatural which may be epitomized by stating that the former is comprehended, the latter only apprehended. We know, for example, what Poe means when he speaks of the dual self in William Wilson, but we do not comprehend the methods by which that duality is to be brought about. In this lack of comprehension lies the attraction of the supernatural. It is one phase of the larger appeal of the romantic, which includes it; and it springs from that ever present demand for what is strange and new which is a part of the nature of man. It is of interest to note that in the nineteenth century, which has demanded an ever increasing exactitude in science, and in America, where commercial standards have always been definite, there has been developed to a remarkable degree a literature dealing with that which cannot be proved or understood.