'26 Ci. V. HAxMILTOX 



TABLE 7 



Average number of E-reactions per 100 trials 

 Group 



Girls (incomplete records excluded ) 



Girls (feeble-minded cases excluded) 



Baboon and Monkeys 



(atypical Monkeys 5 and 26 excluded) 



Mouse 



Gray Rats 



Black Rats 



White Rats 



Gophers 



Although the individual records of D-reactions (table 2) at 

 first sight seem to be quite perplexing on account of the indi- 

 vidual distribution of these reactions, these records and those 

 of E-reactions serve to throw some light on the general problem 

 that concerns the determinants of individual differences of 

 reaction. Table 2 shows that seven-year old Girl 12 had 19 

 D-reactions, whilst four-year old Girls 3 and 4 and five-year 

 old Girl 7 had none. Monkey 16 had only 2 D-reactions whilst 

 Monkey 18 had 13; the maximum nimiber for any individual of 

 the black rat group is 10 and the minimum 3; for white rats the 

 maximum and mininium numbers are respectively 12 and 3, 

 and for gophers they are 10 and 0. 



Girl 12, who gave 19 D-reactions, was bashful, easily distracted 

 and much less attentive to the apparatus situation than to the 

 experimenter. vShe and her sister, Girl S, were two pathetic 

 little Irish girls in a group of swarthy, self-assertive Mexican 

 children, a circumstance which led me to establish bonds of 

 friendship with them that had better have been delayed until 

 the experiments were over. They were easily rattled by their 

 own blunders, and never performed well when they were not 

 allowed to a]ipear in their Sunday clothes. Under these condi- 

 tions Girl 12 fell into the error of reentering an already tried 

 alley after an interval of effort to escape by an as yet (for the 

 trial) untried alley. Her younger sister. Girl 8, under similar 

 conditions was more apt to display the more i^rimitive E-reac- 

 tions, of which she had 11 in 100 trials. 



