Subjects. R. B. A. R. B. A.
2= 3.1 3.2 3.7 2.7 2.5 3.1
3= 4.5 4.4 4.1 4.1 4.0 3.6
4= 5.3 5.0 4.3 4.2 4.6 4.6
5= 6.0 5.1 5.8 5.9 5.2 4.3
6= 6.8 5.6 6.2 6.9 5.3 6.0
7= 7.4 7.2 6.9 7.6 7.3 6.8
8= 8.1 8.4 7.3 8.3 9.7 7.8
9= 9.3 9.0 8.5 9.5 8.9 8.7
Filled 10= 10.1 10.0 8.1 10.3 10.0 9.2
Spaces. 11= 10.5 9.3 9.7 10.6 8.7 9.6
12= 11.7 10.6 10.6 11.8 9.7 10.2
13= 12.3 10.9 10.9 11.1 10.2 9.6
14= 12.2 11.5 12.2 10.4 9.6 11.3
15= 13.6 12.3 11.9 13.1 10.1 9.6
16= 14.1 13.5 14.1 12.3 13.2 13.3
17= 14.9 12.9 14.6 14.1 12.6 13.7
18= 15.0 15.3 14.9 15.0 15.3 13.8
19= 15.2 14.6 15.2 14.1 13.9 14.2
20= 17.1 16.5 15.7 16.1 16.4 14.7

The first line of group I. reads: 'When the finger-tip was
passed over a filled space of 2 cm., the subject _R_ measured
off 3.1 cm. on the open space, the subject _B_ 3.2 cm., and
the subject _A_ 3.7.' In group II., the numbers represent the
distance measured off when both spaces were unfilled.


In my search for the cause of the variations reported previously I
first tried the plan of obliging the subject to attend more closely to