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 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. Eivé, the dunce of our housed hold, won a Terrestrial picture-book on which she had set her fancy by tracing on a forty-inch globe, the first time she saw it, every detail of my journey from Ecasfe as she had heard me relate it; and Eunane, who had never left her Nursery, could describe beforehand any route I wished to take between the northern and southern ice-belts. Under the guidance afforded by the elaborate model abovementioned, all the hollows wherein the materials of eruption were stored, and wherein the chemical forces of Nature had been at work for ages, were thoroughly flooded. Of course convulsion after convulsion of the most violent nature