LOUDON'S ARBORETUM ET FRUTICETUM BRITANNICUM. 
137 
structure, which would result from a more tardy enlargement, and thus, when 
afterwards transferred to the open air, they are found to be particularly tender, to 
part with their heat much sooner than the robust plants which have all along been 
treated as hardy species, and to experience the necessary results — coagulation of 
the vital currents, and immediate decomposition. 
We have above stated the theoretical grounds for an opinion which intimately 
concerns the culture of exotic trees and shrubs, and is, on that account, really 
relevant to our present review. Let us add that it has been abundantly corro- 
borated in practice, and that proofs of its accuracy are constantly transpiring. 
Any person may easily convince himself of this by sowing, in the months of May 
or June, the seeds of a Californian or other annual that is usually considered half- 
hardy in an open flower-pot ; and, at the same time, sowing an equal quantity of 
similar seeds in a stove. If the plants from the former semination are allowed to 
ripen their seeds and scatter them spontaneously, the ground being simply stirred 
after they have fallen in order ^to bury them in the soil, the seeds will produce 
other plants during the autumn, which, provided the winter season is tolerably 
mild, will not sustain the slightest detriment. Again, let the specimens in the 
stove mature their seeds, and let these be committed to a bed adjoining that con- 
taining those which are self-sown, and the decline of the year will rapidly decide 
which are the hardiest. 
At the end of every enumeration of the hardy ligneous plants in each Natural 
Order, Mr. Loudon gives a list of those greenhouse species which he deems likely 
to endure our winters. We attach great value to this ; for the culturist who is 
eager for naturalising foreign species, will here meet with much assistance in 
choosing the most appropriate for experiment, since many of those recorded have 
been known to stand unhurt in sheltered situations. One or two extracts of 
this class will now be made ; although we should first state that all our quotations 
will be from passages most conformable to the object of our Magazine, and not so 
much with the design of displaying the general character of the work. Of 
Tacsonia pinnatistipula, it is said : — 
" The plant, which is exceedingly beautiful, has flowered magnificently, and 
ripened its round yellow fruit, in the conservatory of Mrs. Marryat, at Wimbledon ; 
and it has flowered on the open wall of the garden at Englefield House near Reading. 
There are several other species of this genus which have not yet been introduced. 
Hybrids will, no doubt, be raised between this genus and Passiflora, and perhaps 
something might be gained in hardiness by grafting T. pinnatistipula on Passiflora 
ccerulea." 
Again, in reference to Escalonnia montevidensis, a dwarf, free-flowering, and 
beautiful shrub : — 
" It is a native of Brazil, on sandy banks and pastures, and was introduced in 
1827. It forms a remarkably vigorous-growing bush, with long, flexible, rope-like 
shoots, and is very prolific in flowers. It is so hardy as to have stood through 
VOL. VII. — NO. LXXVIII. T 
