THE DELAYED REACTION IN CATS 105 



and will be carefully considered under " behavior during delay 

 and after release." 



(c) Maximal interval of delay attained with two boxes. — Table 



VII gives the maximal delay attained on two boxes by the 

 subjects studied by Hunter, Walton's dogs, and the cats of the 

 present experiments. The cats rank very well with Hunter's 

 raccoons in successfully bridging delays with two boxes. Just 

 what interval of delay could finally be bridged with the two box 

 tests is not known. It is evident from the above table that the 

 limit of the cats' ability was not reached. I see no reason why 

 the interval may not be increased even into minutes. 



This opinion is based upon the fact that the records show 

 many reactions where the period of delay is of much longer 

 duration than eighteen seconds, the greatest recorded in the 

 above table. The following long periods of delay were each 

 followed by successful reaction. Phil lengthened his delay 

 period- twice during this period of 90 trials, once to twenty seconds 

 and once to twenty-two seconds. Jim reacted correctly after 

 three such periods of delay, twenty-four seconds, twenty-six 

 seconds, and thirty seconds. Bess was successful after the fol- 

 lowing delays : 1 twenty seconds duration, 3 twenty-two seconds, 

 1 twenty-four, 1 twenty-six, 1 thirty-two, 2 thirty-six, 1 forty- 

 two, and 1 fifty-two seconds duration. 



It will be noted that all animals delayed much longer with 



