The humid, grassy, pampean country extends, roughly speaking, half-way
from the Atlantic Ocean and the Plata and Parana rivers to the Andes,
and passes gradually into the "Monte Formation," or _sterile pampa_--a
sandy, more or less barren district, producing a dry, harsh, ligneous
vegetation, principally thorny bushes and low trees, of which the chanar
(Gurliaca decorticans) is the most common; hence the name of
"Chanar-steppe" used by some writers: and this formation extends
southwards down into Patagonia. Scientists have not yet been able to
explain why the pampas, with a humid climate, and a soil exceedingly
rich, have produced nothing but grass, while the dry, sterile
territories on their north, west, and south borders have an arborescent
vegetation. Darwin's conjecture that the extreme violence of the
_pampero,_ or south-west wind, prevented trees from growing, is now
proved to have been ill-founded since the introduction of the Eucalyptus
globulus; for this noble tree attains to an extraordinary height on the
pampas, and exhibits there a luxuriance of foliage never seen in
Australia.
To this level area--my "parish of Selborne," or, at all events, a goodly
portion of it--with the sea on one hand, and on the other the
practically infinite expanse of grassy desert--another sea, not "in vast
fluctuations fixed," but in comparative calm--I should like to conduct
the reader in imagination: a country all the easier to be imagined on
account of the absence of mountains, woods, lakes, and rivers.
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