I

Times
Reacted to
Total Number
of Pecks[19]
Red1231
Yellow921
Orange634
Green511
Blue13

I should attach no importance whatever to the quantitative estimate given in the table. The only fact of value so far is the evidence that from the first the chick reacts to all colors. In no case was there any random pecking at the white surface of the cardboard.

On a black background the same chicks reacted to all the colors.

II is a table of the results.