Bauhaus-Universität Weimar

four attempts in each position, twelve all told. These were 
recorded separately, hence it is possible to study each effort 
in relation to the position in which it was made. This was 
done for both hands to compare the right with the left in 
regard to quickness, accuracy and direction of error; but it 
has been thought best not to include a discussion of the 
results from this standpoint in the present paper. 
The table contains a study of the observations made with 
the right, or preferred, hand by 173 males and 72 females, 
all those of one individual being treated here as if made in 
one position. They were obtained from several sources, a 
large portion of them being derived from the Psychological 
Laboratory of the Columbian Exposition, Chicago, where 
the apparatus was in use by Prof. Jastrow, and also from 
Harvard students and in the Harvard Summer School of 
Physical Training. Inasmuch as it did not seem possible to 
make a fair classification of these, they have been arranged 
in two divisions, male and female, regardless of ages and 
The first column of the table gives the limits of quickness, 
determining each group of these two classes: the second, in 
the two divisions of the table, gives the number of individu¬ 
als whose reactions lie between the limits noted : the third 
gives the percentage of this number to the total number in 
the class, while the fourth gives the average error which is 
a measure of the accuracy of the movements. It will be 
noticed that the number of individuals of the different groups 
shows a distinct distribution curve with the apex at about 
0.5 Sec. in the males and 0.6 Sec. in the females, suggesting 
that these are near the means. Of course, this quickness is 
made up of the reaction—time proper and the time occupied 
in making the movement from the end of the nose to the 
plane of the apparatus. It will be noticed also that the aver¬ 
age errors for these groups do not vary in ratio to the 
quickness, but that those who make the movement in .35 Sec. 
are almost as accurate as the group making the movement in 
.75 Sec., some being, indeed, more accurate in the former 
case than in the latter. There is a suggestion of uniformity 
in the value of the errors, and one cannot help thinking that


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