Some controversy has arisen as to whether Crookes ever saw the medium and Katie at the same moment. Crookes says in the course of his report that he frequently followed Katie into the cabinet, "and have sometimes seen her and her medium together, but most generally I have found nobody but the entranced medium lying on the floor, Katie and her white robes having instantaneously disappeared."
Much more direct testimony, however, is given by Crookes in a letter to the BANNER OF LIGHT (U.S.A.), which is reproduced in THE SPIRITUALIST (London) of July 17, 1874, p. 29. He writes:
In reply to your request, I beg to state that I saw Miss Cook and Katie together at the same moment, by the light of a phosphorus lamp, which was quite sufficient to enable me to see distinctly all I described. The human eye will naturally take in a wide angle, and thus the two figures were included in my field of vision at the same time, but the light being dim, and the two faces being several feet apart, I naturally turned the lamp and my eyes alternately from one to the other, when I desired to bring either Miss Cook's or Katie's face to that portion of my field of view where vision is most distinct. Since the occurrence here referred to took place, Katie and Miss Cook have been seen together by myself and eight other persons, in my own house, illuminated by the full blaze of the electric light. On this occasion Miss Cook's face was not visible, as her head had to be closely bound up in a thick shawl, but I specially satisfied myself that she was there. An attempt to throw the light direct on to her uncovered face, when entranced, was attended with serious consequences.
The camera, too, emphasizes the points of difference between the medium and the form. He says:
One of the most interesting of the pictures is one in which I am standing by the side of Katie; she has her bare foot upon a particular part of the floor. Afterwards I dressed Miss Cook like Katie, placed her and myself in exactly the same position, and we were photographed by the same cameras, placed exactly as in the other experiment, and illuminated by the same light. When these two pictures are placed over each other, the two photographs of myself coincide exactly as regards stature, etc., but Katie is half a head taller than Miss Cook, and looks a big woman in comparison with her. In the breadth of her face, in many of the pictures, she differs essentially in size from her medium, and the photographs show several other points of difference.
Crookes pays a high tribute to the medium, Florence Cook:
The almost daily seances with which Miss Cook has lately favoured me have proved a severe tax upon her strength, and I wish to make the most public acknowledgment of the obligations I am under to her for her readiness to assist me in my experiments. Every test that I have proposed she has at once agreed to submit to with the utmost willingness; she is open and straightforward in speech, and I have never seen anything approaching the slightest symptom of a wish to deceive. Indeed, I do not believe she could carry on a deception if she were to try, and if she did she would certainly be found out very quickly, for such a line of action is altogether foreign to her nature. And to imagine that an innocent schoolgirl of fifteen should be able to conceive and then successfully carry out for three years so gigantic an imposture as this, and in that time should submit to any test which might be imposed upon her, should bear the strictest scrutiny, should be willing to be searched at any time, either before or after a seance, and should meet with even better success in my own house than at that of her parents, knowing that she visited me with the express object of submitting to strict scientific tests-to imagine, I say, the Katie King of the last three years to be the result of imposture, does more violence to one's reason and common sense than to believe her to be what she herself affirms.*
* "Researches in the Phenomena of Spiritualism."
Granting that a temporary form was built up from the ectoplasm of Florence Cook, and that this form was then occupied and used by an independent being who called herself "Katie King," we are still faced with the question, "Who was Katie King?" To this we can only give the answer which she gave herself, while admitting that we have no proof of it.