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To the Editor:
—May I ask for the publicity of your pages to aid me in procuring coöperation in a scientific investigation for which I am responsible? I refer to the Census of Hallucinations, which was begun several years ago by the Society for Psychical Research, and of which the International Congress of Experimental Psychology at Paris, last summer, assumed the future responsibility, naming a committee in each country to carry on the work.The object of the inquiry is twofold: 1, to get a mass of facts about hallucinations which may serve as a basis for a scientific study of these phenomena; and 2, to ascertain approximately the proportion of persons who have had such experiences. Until the average frequency of hallucinations in the community is known, it can never be decided whether the so-called " veridical " hallucinations (visions or other " warnings " of the death, etc.,
The Census of Hallucinations. JAMA. 1890;XIV(22):807–808. doi:10.1001/jama.1890.02410220035007
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