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~ tropics which have hitherto been merely cosily objects of princely curiosity 
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87. [ 300 ] 
ditions of climate and soil, and that i 
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of the polar regions. And this is no doubt true: but there are, neverthe- 
less, some plants which have a remarkable power of adapting themselves 
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naluralize themselves in climates ‘similar to their own. Of the latter, 
examples present themselves at every step ; all the hardy plants of our 
gardens may, in some sort, be considered of this nature ; for, although 
they do not grow spontaneously in the fields, they flourish almost without 
carein our gardens. The pine-apple has gradually extended itself east- 
ward from America, through Africa, into the Indian Archipelago ; where 
itis now as common as if it were a plant indigenous to the soil ; and, 
in like manner, the spices of the Indies have become naturalized on the 
the coast of Africa, and in the West Indian islands." Of the former de- 
to the flora of which country, that of North America has no rese lance 
Samolus valeraudi is found all over the world, from the frozen north to the 
burning south; associated here with Amentacec similar northert 
50 species are said to be common to Europe and North America, 
and even among the peculiar features of the flora of New Holland, Brown 
récognised 166 European species. Royle has added numerous instances 
The presence of many of such strangers may, undoubtedly, be referred to 
the agenc , by whom they have been transported from climate to 
climate, a th corn, and by other means; as, tor xample, at Pont 
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Juvenal, near Montpellier, the vicinity of which abounds with Barbary 
plants; the seeds of which are known to have been brought across the 
Mediterranean along with the Barbary wool which is disembarked at that 
ion. In like manner, the various kinds of corn have been carried about. 
from country to country, for the service of mankind, until their real home 
has become doubtful. Medicago sativa is common in Chili, whither it. 
has been transported by the Spaniards; and instances, in abundance, o 
But it must not thence be inferred that 
all cases of species, growing in places far away from their kindred forms, are - 
to be referred to migration : for this, the agency of man, of animals, of seas, of 
wind, and of torrents, will, doubtless, have done a great deal ; but none of 
the hot-houses and green-houses of Europe there are thousands of valuable plants of the 
i j 3 but of which 
very many may be profitab'y transpefted to tropical Florida. It is well known that all the 
of the whole torrid zone. Hence the Government of the United States, at a small expense, 
hem ,and from the English, French, 
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