Mutations in Horticulture 629 



ably so since a pink variety would without doubt 

 have a certain horticultural value and would 

 have been preserved if it had occurred. But as 

 far as I have been able to ascertain, it is as yet 

 unknown, nor has it been described until to-day. 

 Summing up the results of this long, though 

 very incomplete, list of horticultural novelties 

 with a more or less well-known origin, we see 

 that sudden appearances are the rule. Having 

 once sprung into existence the new varieties are 

 ordinarily constant, except as affected by 

 vicinism. Details concerning the process are 

 mostly unavailable or at least are of very doubt- 

 ful value. And to this it should be added that 

 really progressive mutations have hardly been 

 observed in horticulture. Hence the theoretical 

 value of the facts is far less than might have 

 been expected. 



