Man a Creator 59 



ing more or less pure on individual plants. An 

 ordinary crop is therefore an assemblage of 

 many varieties. Only as you succeed in pro- 

 ducing seed of a single variety wiU the crop 

 raised be uniform or dependable. He therefore 

 undertook to establish a number of these pure- 

 line or pedigree cultures and find out by 

 experimental planting in various locations which 

 one was best adapted to yield large crops in a 

 particular soil and particxilar chmate. So he 

 has been able to furnish the farmers of Sweden, 

 working under the very diverse conditions that 

 exist there, the particular types of wheat or 

 oats that best fit their needs. Often it is 

 necessary to hybridize two or more varieties 

 and establish the right combination of desirable 

 qualities by selection, but this is a relatively 

 simple matter when pedigree cultures are at 

 hand, each breeding true to one or more of the 

 characters needed. 



Our cultivated wheat was derived from a 

 wild plant similar to, if not identical with, one 

 discovered recently growing like grass in the 

 rock crevices and sparse soil of the rougher 



