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20 J. D. Hooker, Introductory Essay to the Flora of Tasmania. » 
23. There is much to be observed in the condition and distri- — 
bution of the introduced or naturalized plants of a couniry, 
which may be applied to the study of the origin of its indigen- 
ous vegetation. The greater proportion of these are the annual 
: venture to anticipate that a study of the vegetation of 
islands with reference to the peculiarities of their generic types 
on the one hand, and of their geological condition (whether as 
rising or sinking) on the other, may, in the present state of our 
knowledge, advance the subjects of distribution and variation 
a 
vegetation of all which is characterized by great diversity and 
much peculiarity of generic type: whereas those marked as atolls 
or barrier reefs, as the Maldives, Laccadives, and Keeling Island, 
contain few species, and those the same as grow on the nearest 
these apparent facts, especially as the New Hebri 
} _fact y as the New Hebrides and New 
Caledonia, which lie very close together, and both, I believe, 
* 35. 
t See his works on volcanic islands and on coral reefs, 
: 
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