Hilgard who directed this investigation and who gave invaluable assistance in organizing and interpreting the data. I am also indebted to Dr. Lewis M. Terman and Dr. Quinn McNemar for criticisms and suggestions for the improvement of the study. I wish also to acknowledge my debt of gratitude to my wife, Eva M. Bell, who assisted with the clerical and statistical work. Finally, I desire to express my thanks to the subjects who took part in the experiment.

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The retention of motor skill has been studied by numerous experimenters since the early work of Book and Swift on typewriting in which a high degree of retention was found even after a lapse of two years. A summary of significant studies on longtime retention in motor skills has been made by McGeoch (2).A study (i) of the effect of rest pauses of varying lengths interpolated early and late in learning on the acquisition of pursuit rotor skill has been reported by the writer. In this investigation 457 subjects were given 20 trials of one min. each separated by a one-min. rest except where longer 600 500 boo 300 zoo 100