Wonderful or supernatural events are not so uncommon, rather they are irregular in their incidence. Thus there may be not one marvel to speak of in a century, and then often enough comes a plentiful crop of them; monsters of all sorts swarm suddenly upon the earth, comets blaze in the sky, eclipses frighten nature, meteors fall in rain, while mermaids and sirens beguile, and sea-serpents engulf every passing ship, and terrible cataclysms beset humanity.