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The kind of sponge-stone taken from this region is not produced everywhere else, but only about Aetna and among the hills of Mysia which the Greeks call the "Burnt District," and in other places of the same peculiar nature.

The Duchess also made much use of Baccio in the Pitti garden, where she had caused to be constructed a grotto full of tufa and sponge-stone formed by the action of water, and containing a fountain; and for this Baccio had caused his pupil, Giovanni Fancelli, to execute in marble a large basin and some goats of the size of life, which spout forth water, and likewise, for a fish-pond, after a model made by himself, a countryman who is emptying a barrel full of water.

In one of these there was to be a large statue of stone, representing Monte Asinaio, which, pressing its beard, was to pour water from its mouth into a basin that was to be in front of it; from which basin the water, issuing by a hidden channel, and passing under the wall, was to flow to the fountain that there is at the present day behind the wall, at the end of the slope of the garden of the labyrinth, pouring into the vase on the shoulder of the figure of the River Mugnone, which is in a large niche of grey-stone decorated with most beautiful ornaments, and all covered with sponge-stone.

And a fine thing it was to hear their strange and diverse opinions about the matter, for the reason that some said that piers must be built up from the level of the ground, which should have the arches turned upon them and should uphold the wooden bridges for sustaining the weight; others said that it was best to make the cupola of sponge-stone, to the end that the weight might be less; and many were agreed that a pier should be built in the centre, and that the cupola should be raised in the shape of a pavilion, like that of S. Giovanni in Florence.

Likewise also it is related that in ancient times the tides of heat, swelling and overflowing from under Mt. Vesuvius, vomited forth fire from the mountain upon the neighbouring country. Hence, what is called "sponge-stone" or "Pompeian pumice" appears to have been reduced by burning from another kind of stone to the condition of the kind which we see.