And as to things Not mentioned here which of themselves do grow Or of themselves are gendered, and all things Which in the clouds condense to being--all, Snow and the winds, hail and the hoar-frosts chill, And freezing, mighty force--of lakes and pools The mighty hardener, and mighty check Which in the winter curbeth everywhere The rivers as they go--'tis easy still, Soon to discover and with mind to see How they all happen, whereby gendered, When once thou well hast understood just what Functions have been vouchsafed from of old Unto the procreant atoms of the world. Now come, and what the law of earthquakes is Hearken, and first of all take care to know That the under-earth, like to the earth around us, Is full of windy caverns all about; And many a pool and many a grim abyss She bears within her bosom, ay, and cliffs And jagged scarps; and many a river, hid Beneath her chine, rolls rapidly along Its billows and plunging boulders. For clear fact Requires that earth must be in every part Alike in constitution. Therefore, earth, With these things underneath affixed and set, Trembleth above, jarred by big down-tumblings, When time hath undermined the huge caves, The subterranean. Yea, whole mountains fall, And instantly from spot of that big jar There quiver the tremors far and wide abroad. And with good reason: since houses on the street Begin to quake throughout, when jarred by a cart Of no large weight; and, too, the furniture Within the house up-bounds, when a paving-block Gives either iron rim of the wheels a jolt. It happens, too, when some prodigious bulk Of age-worn soil is rolled from mountain slopes Into tremendous pools of water dark, That the reeling land itself is rocked about By the water's undulations; as a basin Sometimes won't come to rest until the fluid Within it ceases to be rocked about In random undulations.