282 



The Dancing Mouse 



time it enters a black box, will it transmit to its offspring a 

 tendency to avoid black? 



Systematic training experiments were carried on with 

 individuals of both the 200 and 400 lines of descent. For 

 each of these lines a male and a female were trained at the 

 age of four weeks to discriminate between the white and the 

 black electric-boxes and to choose the former. After they 

 had been thoroughly trained these individuals were mated, 



TABLE 53 



THE INHERITANCE OF THE HABIT OF WHITE-BLACK DISCRIMINATION 

 Number of Errors in Daily Series of Ten Tests 



