564 



KARL T. WAUGH 



Experiment (b) Selection of colored yarns. 



Method : The apparatus as well as the method here used was 

 the same as that used in the experiment on the selection of gray 

 yarns (see p. 555). Three animals, all of them mothers of litters, 

 were subjects in the experiment. 



MOUSE COLOR 



K white 



X black 



V white 



DATE OF EXPERIMENT 



female 

 female 

 female 



3 months 

 6 months 

 cir. 1 year 



Mch.-Apr., 1906 

 Jan.. 1907 

 Jan.. 1907 



Four colors, blue, red, yellow and green, of as full saturation 

 as possible, were selected from among the yarns used in the 

 laboratory for testing color blindness. These were hung in a 

 row in the back part of the mouse's cage, all at the same distance 

 from the opening into the nest. After the four pieces had been 

 pulled down and carried into the nest one after another, another 

 set was arranged in a different order, as in the previous experiment 

 with gray yarns. 



Results: These are presented in tables, each table represent- 

 ing a series of 96 selections of yarns. 



