664 'Journal of Comparative Neurology and Psychology. 



presented to the animal simultaneously in order to determine whether 

 he would learn to select the glass in which food was placed. Only 

 two animals were used, as we had found in numerous earlier tests 

 with four animals that they did not exhibit individual differences of 

 ])ehavior so pronounced as to invalidate general conclusions. These 

 animals are designated by numbers as in the earlier paper. ^^ 



As a means of presenting the row of glasses to the animal, we 

 first employed a board such as Kinnaman^'^ had used in testing the 

 color vision of monkeys, and Davis^^ afterwards employed for the 

 same purpose with raccoons. In this board, 5 feet by 8 inches by 

 114 inches, round holes, eight inches apart, were sunk to the depth of 

 one-half inch. Into these holes the bottoms of the glasses fitted 

 closely. The position of the food glass on this board was changed 

 after each trial. 



This board was used by us on the floor for two days. On the 

 third day we raised it four inches above the floor, and later ten inches 

 above it. Thus raised on supports, we used it for the tests of the 

 three following days. We give the results obtained with this piece of 

 apparatus for each of the two raccoons during the six days. The 

 average number of trials per day was 198. The colors of Group 5 

 were used and the food was placed in the glass covered with OYS 1. 

 The percentages of right choices are given to the nearest integer. 



TABLE 2. 

 Raccoon No. 2. 



"Cole, L. W. Concerning the intelligence of raccoons. Jour. Comp. Neur. 

 and Psych., vol. 17, pp. 211-261. 1907. 



"KiNNAMAN, A. .T. Mental life of the two Macacns rhesns monkeys in 

 captivity. Amer. Jour, of Psych., vol. 13, p. 139. 1902. 



^■^Davis, H. B. The raccoon : a study in animal intelligence. Amer. Jour, 

 of Psych., vol. 18, p. 479. 1907. 



