HABIT FORMATION IN THE ALBINO RAT 



39 



on account of their age. Little difference in behavior was noted 

 between them and the three hundred day animals. 



Too few rats have been used to make this group really com- 

 parable with the rest, but averages and totals are nevertheless 

 shown. Trials varied in number from eighteen to fifty-six, ab- 

 solute time from five and four tenths seconds to seventeen and 

 eight tenths seconds, total time from. one hundred and sixty- 

 seven minutes to eleven hundred and sixty-seven minutes, and 

 total distance from one hundred seventy-two and eight tenths 

 meters to six hundred forty-one and six tenths meters. 



Again there is no relation apparent between trials and time 

 or distance, and total time and total distance do not bear a 

 proportional relation to each other. (Table VI). The rat which 



TABLE VI 

 FIVE HUNDRED DAY RATS 



4 males 7 females 



Rat 



9 

 10 

 11 



Trials 



32 

 43 

 18 

 56 



Time 



(sees.) 



1331.8 

 7004.0 

 6021.8 

 2877.6 



Distance 

 (cm.) 



20922.2 

 42167.8 

 17280.0 

 64167.4 



Absolute 

 time 

 (sees.) 



16.2 



7.6 



17.8 



5.4 



