PATTERN-DISCRIMINATION IN VERTEBRATES 359 



TABLE 4 

 Record of Chick 2 



o <v o 



C/3 



Date 5 S -g M -g y g Remarks 



£* g-fi 18-S 



Dec. 18 2.230 10 4 In general room illumination. 



" 19 2.230 10 4 Very light charge on grills; no disturbance. 



" 20 2.230 10 4 



" 21 2.230 10 3 Tendency to choose box where last fed. 



" 22 2.230 10 2 Tendency to choose box where last fed. 



" 24 2.230 10 7 Not worked previous day; box being altered. 



" 25 2.230 10 3 Disturbed by punishment. 



Jan. 7 2.230 4 1 Greatly disturbed by punishment; removed. 



" 8 2.230 10 6 Very inactive; charge reduced. 



" 9 2.230 10 4 Inactive. 



" 10 2.230 10 7 Under dark-room conditions; not punished; 



inactive. 



" 11 2.230 10 9 Notpunished; this and following series in darkness. 



" 12 2.230 10 9 Not punished; responses slow. 



" 13 2.230 10 9 Notpunished; slept 23 minutes; active after trial 3. 



" 14 2.230 10 7 Light charge on grills. 



" 15 2.230 10 5 



" 16 2.230 10 9 



"17 2.230 10 7 Very slow. 



" 18 2.230 10 8 Very slow. 



" 19 2.230 10 9 



" 20 2.230 10 8 



" 21 2.230 10 10 Considered ready for stimulus-threshold tests. 



" 22 1.951 10 10 



" 23 1.951 10 10 



" 24 1.735 10 10 



" 25 1.561 10 10 



" 26 1.419 10 10 



" 27 1.301 10 10 



" 28 1.301 10 8 



" 29 1.301 10 8 



" 30 1.301 10 10 



" 31 1.201 10 9 



Feb. 1 1.201 10 8 



" 1 1.201 10 6 Series delayed about 5 hours. 



"3 2 . 230 10 10 Preliminary practice series deemed advisable. 



" 3 1.201 10 10 



" 4 2.230 10 10 



" 4 1.115 10 10 



" 5 2.230 10 9 



" 5 1.041 10 10 



" 6 2.230 10 10 



" 6 0.975 10 10 



" 7 2.230 10 10 



" 7 0.940 10 8 Bird in poor condition after prolonged fighting. 



" 8 2.230 10 10 



" 8 0.867 10 5 Greatly excited by "inductive kick;" see note. 



" 9 2.230 5 4 



" 9 0.867 10 8 One wing badly lacerated from fighting. 



" 10 2.230 5 5 



" 10 0.781 10 8 



