[110] Therefore the steep road begins with the earth; for when it is wasted away it endures a change to water, and the water when it has evaporated is changed into air, and the air when rarefied is changed into fire; but the downward road descends from the head, when the fire in consequence of the conflagration which ensues settles down into air, and again when the air being closely pressed settles down into water, and when the water by its copious effusion is condensed so as to be changed into earth.