25 



will be produced so long as the seeds are large enough to pro- 

 duce vigorous plants. 



The farmer and the plant-breeder may plant the small potato 

 tubers or the small seeds without any danger of deterioration in 

 the yield and quality of the crop provided they select these 

 tubers or seeds from plants which yield the largest quantity and 

 the finest quality of tubers or of seeds. 

 STATION FOR EXPERIMENTAL EVOLUTION, 

 COLD SPRING HARBOR, LONG ISLAND. 



