1. If a person with a knowledge of photography takes his own glass plates, examines the camera used and all the accessories, and watches the whole process of taking a picture, then, if any definite form appears on the negative besides the sitter, it is a proof that some object was present capable of reflecting or emitting the actinic rays, although invisible to those present. 2. If an unmistakable likeness appears of a deceased person totally unknown to the photographer. 3. If figures appear on the negative having a definite relation to the figure of the sitter, who chooses his own position, attitude and accompaniments, it is a proof that invisible figures were really there. 4. If a figure appears draped in white, and partly behind the dark body of the sitter without in the least showing through, it is a proof that the white figure was there at the same time, because the dark parts of the negative are transparent, and any white picture in any way superposed would show through. 5. Even should none of these tests be applied, yet if a medium, quite independent of the photographer, sees and describes a figure during the sitting and an exactly corresponding figure appears on the plate, it is a proof that such a figure was there. Every one of these tests have now been successfully applied in our own country, as the following outline of the facts will show: The accounts of spirit-photography in several parts of the United States caused many Spiritualists in this country to make experiments; but for a long time without success. Mr. and Mrs. Guppy, who are both amateur photographers, tried at their own house, and failed. In March, 1872, they went one day to Mr. Hudson’s, a photographer living near them (not a Spiritualist), to get some _cartes de visite_ of Mrs. Guppy. After the sitting the idea suddenly struck Mr. Guppy that he would try for a spirit-photograph. He sat down, told Mrs. G. to go behind the background, and had a picture taken. There came out behind him a large, indefinite, oval white patch, somewhat resembling the outline of a draped figure. Mrs. Guppy, behind the background, was dressed in black.