THE WHITE BLACKBERRY 327 



hybridize the brownish white berry with some 

 allied species in order to bring out the tendency 

 to variation and thus afford material for selective 

 breeding. 



Creating a Really White Blackberry 



The first cross effected was with the Lawton 

 blackberry, using pollen from the Lawton berry. 

 The Lawton is known to be very prepotent ; it is 

 of a very fixed race and will reproduce itself 

 from seed almost exactly, which is not true of 

 most cultivated fruits. Its seedlings often seem 

 uninfluenced when grown from seed pollinated 

 by other varieties. 



It was to be expected, therefore, that the cross 

 between the Lawton and the "white" berry would 

 result in producing all black stock closely resem- 

 bling the Lawton; and such was indeed the re- 

 sult. 



But the Lawton also imparts its good qualities 

 to hybrids when its pollen is used to fertilize the 

 flowers of other varieties. As a general rule, it is 

 my experience that it makes no difference which 

 way a cross is eff'ected between two species of 

 plants. The pollen conveys the hereditary 

 tendencies actively, and so-called reciprocal 

 crosses usually produce seedlings of the same 

 character. 



