A generally acceptable method of comparing psychotomimetic compounds has apparently not been devised. A method of this type would provide the replicability not now available in the newly developed field of psycho-pharmacology. For example, the method employing the Cold Spring Harbor questionnaire devised by the writer and his co-workers has been criticized as being “too suggestible”, “too structured”, or “insufficiently cognizant of unconscious processing”. It is the purpose of this communication to show that the Cold Spring Harbor questionnaire (1, 2) provides a suitable method of study of the psychotomimetic drugs similar to d-lysergic acid diethylamide (LSD-25). The basis for this statement is the comparison made here of the results of an independent study of a series of congeners of LSD-25 made by Isbell, Miner and Logan (3) in another laboratory, in a different milieu, and on a different population sample. It has been found that the comparative effectiveness of a series of LSD congeners both at Cold Spring Harbor and at Isbell's laboratory in Lexington, Kentucky are the same when the Cold Spring Harbor questionnaire is employed.
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