Books on geology trace out for us the long successive periods during which the earth's surface was formed. Even in the Archaean age something in the form of life may have appeared. Perhaps vast masses of dank seaweed germinated as the earliest of plants in the steaming oceans. The water warred against the land, tearing and breaking at its rock formation and distributing it in new strata, each buried beneath the next and holding fast within it the fossilized remains that form the record of its history. Huge fern plants spread their giant fronds in the dank sunless atmospheres, to be buried later in vast beds of decaying vegetation that form the coal-fields of to-day. Animal life began first, like the plants, in the bosom of the ocean. From the slimy depths of the water life crawled hideous to the land. Great reptiles dragged their sluggish length through the tangled vegetation of the jungle of giant ferns.