ALCOHOLISM AND BEHAVIOR OF WHITE RATS 



279 



FREQUENCY DISTRIBUTIONS OF 



THE NUMBER OFTRIALS 

 BEFORE THE FIRST RERFECT TRIAL 



NUMBERS 

 OF RATS 



5 10 15 20 25 30 35 



NUMBERSOF TRIALS 



TESTS 



TEST AVERAGES 



CONTROLS 



CONTROL AVERAGES ^ 



Fig. 16 Frequency distributions of the number of trials required before the 

 first perfect trial. Units on the base line are trials; units on the vertical scale 

 are individuals. 



FREQUENCY DISTRIBUTIONS OF 



25 



20 



4 6 



SECONDS 



10 12 



20 



Fig. 17 Percentage distribution of the time spent in running perfect trials. 

 Units on the base line are seconds, units on the vertical scale are per cent. 

 The broken line shows the tests; the solid line, the controls. 



