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A student of experimental psychology was engaged in trying to discover the nature of the intellectual processes involved in the performance of certain tests devised for the determination of mechanical ability, and for this purpose was applying some of the tests to another student, who was asked to give a full introspection of what he could detect passing through his mind while attempting to perform the tests. This latter student (the 'subject' of the experiment), though of little general mechanical ability or training, had performed several of the tests with reasonable success, but found great difficulty over the solution of the following simple problem, to which he at first gave an erroneous answer and which he was only able to solve correctly after much effort and after the lapse of a considerable period.