Their Extinction Has Probably
Been Caused By The Entire Destruction Of The Woods, And
The Consequent Loss Of Food And Shelter, Which Occurred
During The Early Part Of The Last Century.
The history of the changes, which the elevated plains of
Longwood and Deadwood have undergone, as given in General
Beatson's account of the island, is extremely curious.
Both plains, it is said in former times were covered with
wood, and were therefore called the Great Wood.
So late
as the year 1716 there were many trees, but in 1724 the old
trees had mostly fallen; and as goats and hogs had been
suffered to range about, all the young trees had been killed.
It appears also from the official records, that the trees were
unexpectedly, some years afterwards, succeeded by a wire
grass which spread over the whole surface. [3] General Beatson
adds that now this plain "is covered with fine sward, and
is become the finest piece of pasture on the island." The
extent of surface, probably covered by wood at a former
period, is estimated at no less than two thousand acres; at
the present day scarcely a single tree can be found there. It
is also said that in 1709 there were quantities of dead trees
in Sandy Bay; this place is now so utterly desert, that nothing
but so well attested an account could have made me believe
that they could ever have grown there. The fact, that the
goats and hogs destroyed all the young trees as they sprang
up, and that in the course of time the old ones, which were
safe from their attacks, perished from age, seems clearly
made out. Goats were introduced in the year 1502; eighty-six
years afterwards, in the time of Cavendish, it is known
that they were exceedingly numerous. More than a century
afterwards, in 1731, when the evil was complete and
irretrievable, an order was issued that all stray animals should
be destroyed. It is very interesting thus to find, that the
arrival of animals at St. Helena in 1501, did not change the
whole aspect of the island, until a period of two hundred
and twenty years had elapsed: for the goats were introduced
in 1502, and in 1724 it is said "the old trees had mostly
fallen." There can be little doubt that this great change in
the vegetation affected not only the land-shells, causing eight
species to become extinct, but likewise a multitude of insects.
St. Helena, situated so remote from any continent, in the
midst of a great ocean, and possessing a unique Flora, excites
our curiosity. The eight land-shells, though now extinct,
and one living Succinea, are peculiar species found nowhere
else. Mr. Cuming, however, informs me that an English
Helix is common here, its eggs no doubt having been imported
in some of the many introduced plants. Mr. Cuming
collected on the coast sixteen species of sea-shells, of which
seven, as far as he knows, are confined to this island.
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