x CONTENTS 
CHAPTER 
XXIV. Puanr BREEDING... . oo Ste 2b Bs a Saeed ots 
Deleetom sy gy sate. Sows Reeds Seles a art we ee A Re 
Mass:culture: sg wos a ae ee ce a wo Se 
Pedigree culture . 2... 2... eee eee ee es 
Selection of Mutants ....... ty. Ceca A 
Hybridization ae : é wie fat a 
Crossing and vigor of offspring .  . 2... ee ee eee 
