Vegetative Mutations. 
619 
of the sexual cells, and perhaps even before the origin 
of the flower itself. In other words : 
Germinal variations may be regarded as a special case 
of vegetative mutations; and this possibility always re- 
mains open where the contrary cannot be proved. 
Concluding these discussions I propose now to adduce 
a series of facts in which mutations have occurred vege- 
tatively, that is to say, such facts as have hitherto been 
dealt with as bud-variations. It will be necessary to 
Fig. 138. Cryptomeria japonica spiraliter falcata, with an 
atavistic branch (see page 628). 
consider three groups of phenomena separately: first, 
vegetative segregation in hybrids; secondly, vegetative 
atavism in eversporting varieties, especially as exhibited 
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 phenom- 
ena ; but this may perhaps be due to the fact that in many 
