With colored cardboards inside the electric-boxes
as well as at their entrances (see Figure 14 for position
of cardboards) blue-orange tests were given to Nos.
2 and 3 until they discriminated perfectly. The
papers were Bradley’s blue tint No. 1 and orange.
Number 2 was perfect in the twelfth series (Table
17), No 3 in the fourteenth and again in the sixteenth.
They were then tested with a special brightness check
series which was intended by the experimenter to reveal
any dependence upon a possible brightness difference
rather than upon the color difference of the boxes.
LIGHT BLUE-ORANGE TESTS IN COLOR DISCRIMINATION BOX
SERIES DATE NO. 2
NO. 3
1906
RIGHT WRONG RIGHT WRONG
(LIGHT
(ORANGE) (LIGHT (ORANGE)
BLUE)
BLUE)
1 Jan. 26 7 3 1 9
2 27 7 3 5 5
3 28 7 3 6 4
4 29 7 3 7 3
5 30 7 3 4 6
6 31 10 0 7 3
7 Feb. 1 9 1 7 3
8 2 8 2 6 4
9 3 9 1 9 1
10 5 7 3 5 5
11 6 8 2 5 5
12 7 10 0 5 5
Special brightness check series (see Table 18)
13 8 10 0 7 3
Special light blue-dark blue series
14 9 8 2 10 0
15 10 9 1 9 1
Special light blue-dark blue series
16 11 9 1 10 0
Special brightness
check series
17 12 10 0 9 1
LIGHT BLUE-ORANGE
Brightness check series Mouse
No. 2, Series 13
Feb.
8, 1906
1 Light blue on right
Orange on left Right ____
2 Light blue on left
Orange on right Right ____
3 Light blue on right
Red substituted for orange Right ____
4 Light blur on left
Red substituted for orange Right ____
5 Dark blue on right
Orange on left Right ____
6 Dark blue on left
Orange on right Right ____
