How Domestic Varieties Originate 



221 



the desired object is attained. It is important, if he is 

 to make rapid progress, that he keep the same ideal in 



(1) Grand Rapids, one parent 

 used in developing improved 

 types. 



(2) Golden Queen, the other 

 parent used in developing 

 improved types. 



(3) New loose type for the 

 western market, secured by 

 crossing the varieties shown 

 in (1) and (2). 



(4) New head type for eastern 

 conditions, secured by cross- 

 ing the varieties shown in 

 (1) and (2). 



FIG. 57. Improved types of lettuce and the varieties from which 

 they were developed. 



mind year after year, otherwise there will be vacillation, 

 and the progress of one year may be undone by a counter- 

 direction the following year. In this way it will be 



