A few feet below the surface, and hundreds of miles distant
from the sea, the sea-sand is found; and although the ground seems to
rise gradually as it recedes from the shores, the southern plains are
but a very little elevated above the surface of the sea until you arrive
at thirty degrees north, when the prairies begin to assume an undulating
form, and continually ascend till, at the foot of the Rocky Mountains,
they acquire a height of four and five thousand feet above the level
of the sea.
Texas does not possess any range of mountains with the exception that,
one hundred miles north from San Antonio de Bejar, the San Seba hills
rise and extend themselves in a line parallel with the Rocky Mountains,
as high as the green peaks in the neighbourhood of Santa Fe. The San
Seba hills contain several mines of silver, and I doubt not that this
metal is very common along the whole range east of the Rio Grande. Gold
is also found in great quantities in all the streams tributary to the
Rio Puerco, but I have never heard of precious stones of any kind.
Excepting the woody districts which border Louisiana and Arkansas, the
greater proportion of Texas is prairie; a belt of land commences upon
one of the bends of the river Brasos, spreads northward to the very
shores of the Red River, and is called by the Americans "The Cross
Timbers;" its natural productions, together with those of the prairies,
are similar to those of the Shoshone country.
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