72 



The Potato 



and 249 bushels. Within the sixteen-year period, the 

 methods of culture were kept practically the same 

 and the result is, therefore, attributed to the result of 

 selection. 



Waid has conducted at the Ohio Experiment Station 

 a series of experiments for the purpose of securing data 

 to throw more light on the question of the value of hill 

 selection in potatoes. In this work, starting with the 

 same original lot of tubers, three strains were grown 

 as follows : (1) seed from high-yielding hills ; (2) seed 

 from low-yielding hills ; (3) unselected seed. The fol- 

 lowing table gives the summary of the results that were 

 obtained from high-yielding hills and from low-yielding 

 hills : 



Table XI. — Summary of Results from Use of Seed Po- 

 tatoes PROM High-yielding Hills and from Low-yield- 

 ing Hills. (Variety, Carman No. 3) 



Source or Seed 



High-yielding hills 

 Cheek rows . 

 Low-yielding hills 



Yield of 100 Hills 



Total Total Total Average 

 1904 1905 1906 1904-5-6 



Lhs. 



125 

 115 



84 



IJ)S. 



173 



136 



75 



Lbs. 



116 

 79 

 61 



Lhs. 



138 



110 



73 



Number op Tubers in 

 100 Hills 



Total Total Total Average 

 1904 1905 1906 1904-5-6 



781 



713 

 566 



865 

 630 

 546 



676 

 479 

 364 



774 

 607 

 492 



Running out of varieties 



Potatoes are grown in many parts of the world where 

 the climate and soil are very different from that of their 

 native home. Also all of our varieties which have been 

 developed as a result of breeding give yields far in excess 



