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There was a time when a physiologist might catch a few frogs, take a piece of wire and a bit of rubber, borrow or build a kymograph, and with these and similar modest materials undertake to clarify fundamental problems of the action of the heart or the behavior of muscle; but now, judging by this little brochure, methods, apparatus and problems have changed. The present authors secured thirty-six human subjects, gave them directions and printed forms for recording data, fitted their beds with a device to record the motions of the sleeper —it is called a work adder—and proceeded to study the effects of drugs and foods on the characteristics of sleep. The data were then transferred to punch cards, tabulated with the aid of a Hollerith census machine, and the results treated by statistical methods. Among the conclusions so obtained appears the startling pronouncement (which, however, the writers of
Sleep Characteristics: How They Vary and React to Changing Conditions in the Group and the Individual. JAMA. 1937;109(23):1932. doi:10.1001/jama.1937.02780490070033