Abstract
In the tenth Maudsley Lecture a plan was put forward by Prof. Spearman for conducting a large-scale research in psychiatry. The proposal was that many mental hospitals might co-operate in a joint experiment. Psychiatrists would give their psychiatrical and physiological accounts of selected patients; and psychologists would apply specially prepared clinical mental tests to these same patients. The mass material from many hospitals was to be collocated in order to see, as Prof. Spearman says, “what goes with what, and what follows what.”

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