88 



1st STAGE 



Mass-selection 

 for 2 or 3 years 

 from ordinary 

 culture to re- 

 duce the num- 

 ber of inferior 

 types. 



2nd STAGE 



II 



O <J> 



? a 



c 



O O 



3rd STAGE 



tt o 



4th STAGE 



S ! 



a. ^ 



a 2 



FIG. XV. Scheme showing general course of procedure recommended at Svalof in ordinary 

 line-breeding work. This plan may be varied in every conceivable way. (Author del.) 



