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assisted the writer in carrying out the preliminary experiment. Mrs. B. O. Anderson gathered all the data of the main experiment. The senior author devised the apparatus, directed the study, and is responsible for the presentation of the data and interpretation of the results.

Records of muscular tension were secured from 25 subjects during 100 mirror tracing trials distributed over a period of 7 days. Tension was found to be low initially and to increase and to be maintained at a high level with progress in learning. Places of increased difficulty in the pattern were correlated with increased tension. Initial tension is specified as diffuse, while tension associated with progress in learning signified improved localization of tension in the muscle that is specific to the task.

In all cases in this report "age 7" means that the 7th but not the 8th birthday has been passed, and so for all other ages.

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