Potato Breeding 



61 



without a knowledge of their ancestry or obtaining a 

 test of their producing power, is known as "mass-selec- 

 tion." This method will inevitably lead to improvement 



Fig. 9. Continuation of Fig. 8. 



because the very poor hills will not produce good tubers, 

 and hence will be eliminated. But the improvement is a 

 very slow one. In employing this method of mass selec- 



