them was practicable. I selected a shoot of Digitalis 
ambigua for the experiment; half a dozen of its flow- 
ers were carefully fertilized with the pollen of Glox- 
inia speciosa; the shoot was denuded of the remain- 
der of its flower buds, and no more attention was 
bestowed till the capsules were ripe. One half of 
those impregnated, produced perfect seeds, which 
were sown immediately, when ripe, and placed in a 
warm frame till they vegetated, after which they went 
through the usual process of potting, &c. Thus en- 
couraged, they were fit to be transplanted into the 
open borders, the following spring; and I had the 
satisfaction to see one, which took the lead of the 
rest, in flower late the ensuing autumn; and the 
whole of them flowered, in great profusion, in # 
the succeeding year.” Mr. Campbell further states 
that it is a remarkably free flowerer, continuing 
from June till frosts set in; which he very reason- 
ably suggests may arise from its sterility; all his 
attempts to fertilize it having proved ineffectual. 
Most of our readers are aware that no plant can 
perfect its seeds, unless the pollen or powder pro- 
duced by its own anthers, or the anthers of a plant 
nearly related to it, falls on its stigma. This we 
explained under Potentilla Russelliana, No. 304; 
and practically illustrated in Potentilla atrosangu- 
inea-pedata. No. 385, an intermediate variety, which 
we raised between the two very distinct species, in- 
dicated in its compound appellation. How far na- 
ture will admit this system of hybridization, becomes 
a curious and most interesting enquiry. It is ev- 
ident that the present division of genera, forms no 
bar to the production of mules between them. 
