Vegetative Mutations. 



619 



of the sexual cells, and perhaps even before the uri^Mii 

 of the flower itself. In other words : 



Germinal variations may be regarded as a speeial ease 

 of vegetative mutations; and this possibility always re- 

 mains open where the contrary cannot be proved. 



Concluding these discussions I propose now to arlduce 

 a series of facts in which mutations have occurred vege- 

 tatively, tliat is to say, such facts as have hitherto been 

 dealt with as bud-variations. It will be necessary to 



Fig. 138. Cryptomcvia japonica spiralitcr falcafa. with an 

 atavistic branch (sec page 628). 



consider three groups of phenomena separately : first, 

 vegetative segregation in hybrids; secondly, vegetative 

 atavism in eversporting varieties, especially as cxiu'bited 

 by striped flowers (Part I, Plate I), and thirdly, the 

 true vegetative mutations which are usually of an atavis- 

 tic nature (Figs. 137, 138), but sometimes may happen to 

 be of a progressive kind. 



Vegetative segregations in hybrids are rare phencnn- 

 ena; but this may perhaps be due to the fact that in many 



