HABIT FORMATION IN THE ALBINO RAT 



25 



TyTXTT-rTip 



-^un 



m 



m 



m 



lU 



SiS3^3^ 



':z:CX=: 



Figure 4-a Trial Curv^e for Sixty-five Day Rats. 



There are two maxima in the trial curve for this group, (Fig. 

 4-A), at twenty-two and thirty-seven respectively, and the 

 group average lies midway between the two, at thirty-one. 



