LUTHER BURBANK 



of the lettuce, as one cannot be siu-e in many cases 

 that a certain amount of the pollen does not 

 remain to effect fertilization of some neighboring 

 pistil, 



I was able to combine some desirable qualities, 

 but did not succeed in combining all the desired 

 qualities in a single variety. 



There is greater variation as to flavor among 

 lettuces than is commonly supposed. Of course, 

 the different types are used for different purposes 

 and at different seasons. Those grown under glass 

 must be compact growers, while those grown in 

 the open may be permitted to develop larger 

 heads. There are varieties of so-called perpetual 

 lettuce which have been so educated that instead 

 of running to seed they form new heads that can 

 be cut again and again. 



As to all these matters there is room for im- 

 provement, and there is opportunity for the plant 

 experimenter whose experience justifies him in 

 working with a somewhat difficult species to 

 secure better varieties of this very popular salad 

 plant than any at present on the market. 



If it were desired to produce an exceedingly 

 hardy variety of lettuce, it might be possible to 

 hybridize the cultivated species with the wild 

 lettuce. 



I have never attempted to do this, however, as 



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