in one river. Then when the Dog-star increases the heat of the sun and sucks up all moisture, drying up earth’s veins and filling heaven with its scorching rays, winter comes upon the Nile, though elsewhere all is summer. Then, bringing back to the fainting husbandmen its accustomed waters, it o’erflows ampler than the Aegean, fiercer than the deep Ionian, and spreads itself over the low-lying country. All the fields are aswim; plough-land sounds to the beat of the oar, and full often the shepherd, o’ercome with summer’s heat, wakes to see flocks and fold carried away by the flood.
XXIX. (XLVIII.)
The Magnet.
Whosoever with anxious thought examines the universe and searches out the origin of things—the reason of the sun’s and moon’s eclipse, the causes of comets’ red and baneful fires, the source of the winds, the motion that makes the earth to quake, the force that splits the heavens in twain, the noise of the thunder, the brilliance of the rainbow, let this man (if man’s mind has any power to conceive the truth) explain to me something I would fain understand.
There is a stone called the loadstone; black, dull, and common. It does not adorn the braided hair of kings nor the snowy necks of girls, nor yet shine in the jewelled buckles of warriors’ belts. But consider the marvellous properties of this dull-looking stone and you will see that it is of more worth than lovely gems and any pearl sought of
Indus litoribus Rubra scrutatur in alga. 15
nam ferro meruit vitam ferrique rigore
vescitur; hoc dulces epulas, hoc pabula novit;
hinc proprias renovat vires; hinc fusa per artus