Volume I — By Chapters 



Foreword P^fge 3 



I How the Cactvis Got Its Spines • 



And How It Lost Them 



—A Sirlfligbt on » 



The Importance of Environment , * 



II Twenty-three Potato Seeds 



And Wtat They Taught 



—A Glimpse at the q r 



Influeace of Heredity OO 



III No Two Living Things 

 Exactly Alike 



— InGnite Ingenuity the Price /rij 



of Variation Oi 



IV The Rivalry of Plants 

 To Please IJs 



Adaptation 



V Let Us Now Produce a 

 New Pink Daisy 



-A Practical 

 Harnessing Heredity 



VI Short-Cuts Into the 



Centuries to Come 



On the Fonvard March of -i nrj 



— A Practical Lesson in 1/11 



—Better Plants Secured by -» ryiy 



Hurrying Evolution ± i i 



VII How Far Can Plant 

 Improvement Go ? 



—The Cro99road=i Wbpre Fart Oil 



and Theory Seem to Part ^ii 



VIII Some Plants Which Are Begging 

 for Immediate Improvement 



— A Rough Survey of cja r 



the Poaaibilities Z4tD 



IX Piecing the Fragments of a 

 Motion Picture Film 



■ — Wc Stop to Take 07(^ 



A Backward Glance ^ I O 



List of Direct Color Photograph Prints 305 



