h, as subtler experiments, for which
hundredths of a second would have to be considered, were not needed.

[Sidenote: _Results of Experiments_]

"In studying the results, so far as the memory experiments were
concerned, we found that it would be useless to consider the figures
with more than ten digits. We took the results only of those with
eight, nine and ten digits. There were fifty-four possibilities of
mistakes. The smallest number of actual mistakes was two, the
largest twenty-nine. In the experiment on attention made with the
crossing-out of letters, we found that the smallest number of
correctly marked letters was 107, the largest number in the six
minutes, 272; the smallest number of overlooked letters was two, the
largest 135; but this last case of abnormal carelessness stood quite
isolated. On the whole, the number of overlooked letters fluctuated
between five and sixty. If both results, those of the crossed-out and
those of the overlooked letters, are brought into relations, we find
that the best results were a case of 236 letters marked, with only two
overlooked, and one of 257 marked, with four overlooked. The very
interesting details as to the various types of attention which we see
in the distribution of mistakes over the six minutes were not taken
into our final table. The word experiments by which we tested the
intelligence showed that no one was able to reproduce more than
twenty-two of the twenty-four words. The smallest number of words
remembered was seven.

"The mistakes in the perception of distances fluctuated between
one and fourteen millimeters; the time for the sorting of the
forty-eight cards, between thirty-five and fifty-eight seconds; the
association-time for the six associated words taken together was
between nine and twenty-one seconds. The pointing experiments could
not be made use of in this first series, as it was found that quite
a number of participants were unable to perform the act with the
rapidity demanded.

"Several ways were open to make mathematical use of these results. I
preferred the simplest way. I calculated the grade of the girls for
each of these achievements. The same candidate who stood in the
seventh place in the memory experiment was in the fifteenth place with
reference to the number of letters marked, in the third place with
reference to the letters overlooked, in the twenty-first place with
reference to the number of word pairs which she had grasped, in the