HABIT FORMATION IN ALBINO RATS 29 



TABLE IVa 



The Preliminary Inclined Plane 



Daily Learning Averages of Inbred and Normal Control Rats 



(Time in seconds) 



Day 1 Day 2 Day 3 Day 4 Day 5 



Inbred Average 1965.858 1631.178 60.302 45.916 28.116 



Control Average 2470 . 393 971 . 102 79 .775 27 . 564 21 . 840 



Day 6 Day 7 Day 8 Day 9 Day 10 



Inbred Average 11.120 14.833 9.095 16.855 7.109 



Control Average 20 . 305 10 . 375 9 . 869 8 . 971 8 . 058 



Day 11 Day 12 Day 13 Day 14 Day 15 



Inbred Average 6.262 9.465 7.658 10.916 10.291 



Control Average 5.342 5.015 5.055 4.425 4,513 



Day 16 Day 17 Day 18 Day 19 Day 20 



Inbred Average 7.360 6.247 5.531 8.811 10.251 



Control Average 5.062 3,727 4.800 5.815 5.622 



TABLE IVb 



The Preliminary Inclined Plane 



Average Absolute Retention of Inbred and Normal Control Rats. 



Absolute Retention 

 After 60 Days' Rest 



Inbred Average 59 . 309 seconds 



Control Average 49 . 164 seconds 



TABLE IVc 



The Preliminary Inclinted Plane 



Daily Relearning Averages of Inbred and Normal Control Rats 



(Time in seconds) 



Day 1 Day 2 



Inbred Average 24.302 9.905 



Control Average 17 . 102 5 . 498 



TABLE IVd 



The Preliminary Inclined Plane 



Anatomical Data of Inbred and Normal Control Rats 



Body Body Brain Cord Water 



Length Weight Weight Weight in tirain, 



in mm. in grms. in grms. in grms. per cent 



Inbred Average 190 . 82 166 . 50 1 . 62031 . 47535 78 . 565 



Control Average 189 . 45 168 . 08 1 . 81946 . 52819 77 . 982 



Water Per cent Per cent Age 



in Cord, Brain Weight Brain Weight killed, 



Per in Relation to in Relation to Days 



cent Body Length Body Weight 



Inbred Average 71 . 436 '84929 . 98140 194 



Control Average 71 . 128 . 96084 1 , 09571 170 



