22 JOSEPH PETERSON 



RESULTS 



Tables I and II give in a condensed form the main results 

 of the entire experiment. In the separate larger divisions are 

 given the reactions to the several blind alleys. These reactions 

 are classified in a manner most easily made clear by taking 

 up a concrete case. In table I the words " First," " Second," 

 etc. at the top stand for the blind alleys of the B -mazes of the 

 corresponding numbers. The results of the first blind alley, for 

 example, are then divided into three parts, " Complete," " Half," 

 and " Start," meant to designate the degree of entrance by 

 the rats into the blind alleys, as already explained. Complete 

 entrance means going entirely to the end of the blind alley, 

 or so near the end that the animal might reach the end by means 

 of the vibrissae. Frequently the rats ran against the end with 

 considerable force. Half entrance means approximately half 

 way, or all entrances between complete and beginning. Those 

 marked " Start " include cases in which the animal either just 

 put the head in or entered Mdth the fore half of the body. In 

 such cases the hind feet of the animal usually remained in the 

 true path, so that the general orientation was not completely 

 given up as in the other two cases. The three columns coming 

 again under each of these rubrics show respectively, the number 

 of entrances into the blind alley in question, E, the number 

 of returns toward the place of starting in the maze on the rats' 

 emerging from the blind alley, R, and the number of times the 

 animals kept the general orientation, i. e., continued toward 

 the food box, F. The totals for R and F must therefore equal 

 the number under E. 



The figures in the left column of the table indicate the number 

 of the run, or of the test, of the animals, while the letters Mm, 

 S/, etc. stand for the group, as Group M wwtrained. Group S 

 trained, and so on. The description of each group and of its 

 practice distributions are given in detail in the schedule, pages 9 

 and 10, to which frequent reference is advisable. Now, to illus- 

 trate in a concrete case, in the first line of the data, giving results 

 of the first two trials of the animals, we find that Group Mm 

 (eight rats, untrained, running in Maze IB) made nineteen 

 complete entrances into the blind alley No. 1, with ten returns 

 and nine cases in which the rat continued forward toward the 

 food box. There were two entrances half way, with two forward 

 runs and no returns; thirteen beginning entrances, with four 



