54 FREDERICK S. BREED 



atus. That is, forms were cut out of white paper and pasted 

 midway between the two sides and a little below the top of 

 the card. The chicks were first tested with a square and a 

 triangle of equal area. The triangle had a base of 8.13 cm. and 

 an altitude of 6.35 cm. The square was 5.08 x 5.08 cm. No. 11, 

 a chick that had succeeded in acquiring the black-white habit 

 to the point of making one error in the last twenty trials, reacted 

 in the square-triangle test as shown in table 14. 



TABLE 14 



Reactions to Form 



Chick no. 11. Hatched 12/10, '07. Sex, F. 



Square -Triangle 

 Series Date Right Wrong 



A Jan. 31 



1 



2 Feb. 1 



3 " 3 



4 " 4 



5 " 5 



6 " 6 



7 " 7 



8 " 8 



9 " 10 



10 " 11 



11 " 12 



12 " 13 



13 " 14 



14 " 15 6 4 



15 " 17 4 6 



Not only were the results here purely negative, but one had 

 only to watch the chick to become convinced that the prob- 

 ability of its forming the habit of selecting the square was 

 almost nil. 



No. 13, a chick that had acquired the white-black (darkened ') 

 habit perfectly, was tried at the same time by the same method 

 in this form test with the result shown in table 1 5 . 



No. 13 showed no signs of improvement and the experiment 

 was discontinued. The square-triangle combination was dis- 

 carded for a " design " that was placed at the top of the cards. 

 This time the cards in the apparatus were white and the forms 

 upon them black. On one set of cards were pasted, vertically 



' The electric chamber on the side of black was covered with cardboard. 



