HABIT FORMATION IN ALBINO RATS 



41 



TABLE Vic 



THE INCLINED PLANE 



DAILY RELEARNING AVERAGES OF SEVENTH AND EIGHTH GENERATION INBRED RATS 



Seventh Average. 

 Eighth Average. . 



Seventh Average'. 

 Eighth Average. . 



Seventh Average. 

 Eighth Average . . 



Seventh Average. 

 Eighth Average . . 



Seventh Average . 

 Eighth Average . . 



(Time in seconds) 



Day 1 Day 2 



66.322 9.265 

 8.058 4.438 



Day 6 

 6.297 



3.633 



Day 11 



4.285 

 2.441 



Day 16 



2.733 



2.441 



Day 21 



2.727 

 2.441 



Seventh Average. . . 

 Eighth Average .... 



Day 7 



4.467 

 3.925 



Day 12 



2.909 



2.441 



Day 17 

 2.721 



2.441 



Day 22 



2.939 

 2.441 



Failed 



to Relearn 











Day 3 



6.322 

 4.218 



Day 8 



5.879 

 2.441 



Day 13 

 3.055 



2.441 

 Day 18 



2.709 

 2. Ml 



Day 23 



2.709 

 2.441 



Day 4 



5.758 

 3.443 



Day 9 



3.728 

 2.441 



Day 14 

 3.139 



2.441 



Day 19 

 2.945 

 2.441 



Day 24 



2.636 

 2.441 



Days Required 



to Relearn 



8.00 



5.00 



Day 5 



6.279 

 3.400 



Day 10 



3.109 

 2.441 



Day 15 

 3.073 

 2.441 



Day 20 



2.848 

 2.441 



Day 25 

 to 50 



2.636 

 2.441 



TABLE VId 



THE INCLINED PLANE 



ANATOMICAL DATA OF SEVENTH AND EIGHTH GENERATION INBRED RATS 



Body 



Length 



in mm. 



Seventh Average 202. 13 



Eighth Average 189 . 73 



Water 



in Cord, 



per 



cent 



Seventh Average 71 . 569 



Eighth Average 71 .304 



In Plate X is shown the curve of learning (below) and of re- 

 learning (above) of the seventh generation of inbred rats compared 

 with those of the eighth. These curves are constructed from 

 figures given in Table VI. The curve of the seventh generation 

 rats is indicated by the broken line, that of the eighth generation 



