32 LUTHER BURBANK 



experimenters will probably feel that they have 

 not time and energy to spare for the fixing of the 

 new races already developed. 



We shall have occasion to call attention tc 

 various exceptions to this rule in the course oJ 

 our subsequent studies; particularly with refer- 

 ence to certain annual plants. Here by "line' 

 breeding for a few generations we may fix th( 

 new traits almost as firmly as the old traits arc 

 fixed in wild species. Again we shall learn ii 

 due course of new hybrid fruits like the sunberry 

 the Primus berry, and the Phenomenal berry 

 that are fixed as to their chief properties from the 

 very first hybrid generation. But as regards 

 most of the new forms of fruit and flower thai 

 we have hitherto described, the rule holds witl 

 full force. 



Vol. 3 Bur. A 



