There certainly must be some manifestations such as are commonly known as "ghostly." I never have come across any personally, but the testimony is too frequent and persistent for doubt. Some phenomena have undoubtedly been observed of which the laws are not yet understood. The psychologists profess to be working in this direction, but the psychology of our day is still in about the condition of astronomy and chemistry in the days of the thirteenth-century astrologers and alchemists--mere blind flounderings. We need a psychological Copernicus badly. I am convinced that what are commonly called "superstitions" are really observed results of unknown causes. When I was a child the negroes always warned one that it brought bad luck to go near a stable when one had a cut finger. Nothing could seem more blindly uncorrelated, and yet it is now known that the germ of tetanus breeds only in manure, which shows that their observation was correct, though they had no conception of germs, or microbes. It was an old superstition, derided by the medical profession, that there was some merit in hanging red curtains at the windows of a smallpox patient; yet recently some interesting discoveries have been made as to the effect of red light upon sufferers from this disease. Again there is the old-wife's belief that the howling of a dog presages death. I saw no sense in that until I was brought in contact with death for the first time, and then discovered that a person near the end, and immediately afterwards, emitted a powerful odour, very like the smell of tuberoses. In two cases within my experience this odour remained in the death-chamber, despite persistent airing and cleaning, for fully a year. My sense of smell is extremely acute, and no one seemed to remark this odour but myself, nor have I ever heard or seen any mention of the phenomenon being noticed by others; but naturally a dog, whose sense of smell must be a thousand times more acute than mine, is aware of this strange, half repulsive perfume, which has the effect upon his nerves produced also, apparently, by moonlight and by music.