Of course previous to the adoption of this measure,
the crust in the neighbourhood had been carefully explored and tested
by various wonderfully elaborate and perfect boring instruments, and a
map or rather model of the strata for a mile below the surface, and
for a distance around the volcano which I dare not state on the faith
of my recollection alone, had been constructed on a scale, as we
should say, of twelve inches to the mile. Except for minor purposes,
for convenience of pocket carriage and the like, Martialists disdain
so poor a representation as a flat map can give of a broken surface.
On the small scale, they employ globes of spherical sections to
represent extensive portions of their world; on the large scale (from
two to twenty-four inches per mile), models of wonderfully accurate
construction. Consequently, children understand and enjoy the
geographical lesson which in European schools costs so many tears to
so little purpose. A girl of six years knows more perfectly the whole
area of the Martial globe than a German Professor that of the ancient
Peloponnesus.
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