XXXI
1
There is yet a further proof that you may unhesitatingly add to the others that go to show that all these phenomena are the outcome of air. After the most violent shock that cities and provinces can experience has spent itself, another of like violence cannot immediately follow; after the crisis there are only slight shocks, just because the most violent one has opened a way of escape for the struggling winds. The remains of the air that is left have not the same power, nor do they require to struggle; they have now found a way of escape, and follow the path by which the first and greatest shock issued.
2
I am of opinion, too, that the observations of a certain learned and grave philosopher of my acquaintance deserve to be put on record; he happened to be taking a bath when the earthquake occurred. He asserted that he saw the tiles with which the floor of the bathroom was paved, separate one from another and unite again. At one moment, when the pavement opened, the water was taken in through the joints, the next, when the pavement closed, it was forced out all bubbling. I have heard the same learned man relate that he had seen soft materials undergo more frequent but more gentle shocks than materials naturally hard.