The errors were recorded and for each error not corrected, twice the average time per word for the reading of the sheet on which the error was made was added to the time taken by the stop watch. This plan of correction was arbitrary but seemed to be justified by the situation. There were two kinds of failures to be accounted for: first, the failure to see the error: and second, the failure to correct it. Each phase of the situation gave the subject a time advantage which deserved taking note of. Since no accurate objective measure was obtainable and the number of errors was small the arbitrary plan was adopted. Fifty-nine percent of the group left an average of 2.6 errors uncorrected on the NCWd test (200 reactions) and 32 percent of the group left an average of 1.2 errors uncorrected on theNC test (200 reactions). The correction changed the mean on the NCWd test from 108.7 to 110.3 and the mean of the NC test from 63.0 to 63.3.