LIST OF ILLUSTRATIONS 



FACING 

 PAGE 



The improved amaryllis, with blossoms nearly a foot, across 

 and of great brilliancy . . . Frontispiece 



Luther Burbank ..... .1 



Twenty thousand new varieties of plums in process of 



development . . . . . .36 



Walnut-leaf variation. To the left, the common English wal- 

 nut; to the right, the native California black walnut; in 

 the center, the new hybrid " Paradox," bred from 

 the other two . . . . . .51 



One of the hybrid chestnuts, bearing nuts at eighteen 



months of age from the seed . . . .62 



A bed of the hybrid poppies . . . . .74 



The central poppy, a brilliant scarlet with purple center, is 

 the offspring of the other two. The one to the left, 

 Papaver pilosum, a delicate orange ; the one to the right, 

 Papaver somniferum, the "Bride poppy," a pure white. 

 Leaves of each are shown . . . .81 



Wild Arizona potatoes used in breeding, to give strength 



and hardiness to the common potato . . .88 



Potatoes growing upon a tomato vine after grafting upon 



the potato root . ..... 96 



Aerial potatoes growing upon a potato eion grafted upon a 



tomato plant ...... 101 



XV 



