PLANT-BREEDING 



means he increased the number of their culms and heads 

 and the number of the spikelets and kernels in the individual 

 ears. Twenty to fifty and more ears on a plant of wheat 



HALLE IT'S 

 NURSERY (PEDIGREE] WHEAT, 



Ired" upon the same principle of REPEATED Selection which has produced our pure 



ONE OF THE 





ORIGINAL TWO EARS. 



HOW OUR WHEAT CROPS MAY BE DOUBLED. 



Fig. 14. A reproduction of part of the first advertisement of pedigree 

 wheat by F. F. Hallett. See the Times, London, June 18, Nov. 8, and Dec. 

 19, 1862. 



became the rule, and ears with less than 80-100 kernels 

 were commonly rejected. This large increase can in some 

 sense be called artificial. It appears as a direct result of 

 the change of culture and therefore came wholly or almost 

 wholly during the very first year of the selection experiment. 



