David Starr Jordan 



appearance of zebra stripes on horses — ancestral 

 traits not yet bred out." 



From the pale yellow Iceland poppy {Papaver 

 nudicaule) are developed white, yellow and orange 

 forms, and some with striped petals and a strong 

 tendency to become double. Selecting the Ice- 

 land poppy for size alone, flowers three and one- 

 half inches across have been developed. A large 

 scarlet poppy, Papaver glaucum, closes its two 

 inner petals when a bee or two have entered, 

 shutting in the bees, which buzz angrily and cover 

 themselves with pollen until they are set free. If 

 not visited by bees, the flowers do not close. 



A wild form of one of the Liliacas, Brodicea 

 terrestris, was made white by selection of the palest 

 among the pale wild ones. Brodicea lactea taken 

 from the high Sierras where it is a dwarf, becomes, 

 after two years of cultivation, more than twice as 

 high as the original stock, but not nearly as high 

 as the same species grown in the valley. 



Crossing is done to secure a wealth of varia- 

 tion. By this means we get the species into a state 



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