Vegetative Mutations. 
627 
Dut doubt, cases of such hybrid segregation, and therefore 
have no immediate bearing on the question of vegetative 
mutations. The same is true of the bud-variations of 
eversporting varieties (see Plate I, Antirrhinum) which 
Fig. 142. Rhus typhma. A leaf of an otherwise green bush 
which was almost yellow from a to b ; these leaflets have 
grown much smaller (on one side at a), Doom (1886) ; 
collected bv MRS. WEBER. 
have already been dealt with at sufficient length. More- 
over the graded differences between the various branches 
of a plant belonging to an eversporting variety are not 
instances of mutations, and, as a rule, do not affect the 
