The Illustrations 



Page 



Sample Leaves of Common Garden Dahlia {Dahlia 

 variabilis), showing Ordinary Variation within a 

 Species when under Cultivation .... 5 



Primus, the First Fixed Rubus Species Artificially Pro- 

 duced ........ 10 



Leaves Showing a Number of Strawberry-Raspberry 



Hybrids and a Cluster of the Blossoms . . 13 



Opuntia jicus-indica and its Hybrid with O. vulgaris, the 



Hybrid Flower far Larger than Either Parent . 21 



Diagram Showing the Zone of Life and Parallelism of 



Results in Crossing and Grafting. (L. B. ) . 22 



Stems of Blackberry-Raspberry Hybrids . . . 27 



Leaves of Blackberry Raspberry Hybrids . . . 29 



Leaves of a Blackberry Hybrid, all Grown from Seed of 



One Plant 33 



Apples — all Seedlings from One Variety, ' The Early 

 Williams,' showing about the Normal Variation of 

 Apple Seedlings . . . . *. . 37 



Seedlings of Japanese Quinces, showing Normal Varia- 

 tions ........ 41 



The Original and Improved (Shasta) Daisy . . 43 



V 



