THE STRAWBERRY 273 



the introduction of Keen's seedling in England 

 in 1821 and Hovey's seedling in America in 

 1837. 



Subsequent development has come about 

 through the usual method of crossing and selec- 

 tion. Of course, many varieties, differing in such 

 minor details as the production of runners, re- 

 sistance to fungus attacks, and precise qualities 

 of the fruit have been devolepd. Different races 

 also show a diversity as to manner of flowering, 

 certain varieties bearing pistillate flowers, just 

 as the California dewberry does, whereas others 

 bear perfect or bisexual flowers, as is custom- 

 ary with the members of the rose family in 

 general. 



But these are minor differences; and, as we 

 have seen, the strawberry type in all its essentials 

 has been marvelously maintained from first to 

 last. Now as always this fruit is unique and 

 curiously isolated. 



HYBRIDIZING EXPERIMENTS 



My own experiments with the strawberry have 

 been carried out on rather expansive scale, 

 although I have given by no means as much 

 attention to this fruit as to many others. 



I have crossed all the familiar cultivated varie- 

 ties, and in addition have made hybridizing ex- 



