[16.] Deep snow covers two.]—Ver. 50. The two polar or frigid zones. For as the sun never approaches these nearer than the tropic on that side, and is, during one part of the year, removed by the additional extent of the whole torrid zone, his rays must be very oblique and faint, so as to leave these tracts exposed to almost perpetual cold.
[17.] He placed as many more.]—Ver. 51. The temperate zones, lying between the torrid and the frigid, partake of the character of each in a modified degree, and are of a middle temperature between hot and cold. Here, too, the distinction of the seasons is manifest. For in either temperate zone, when the sun is in that tropic, which borders upon it, being nearly vertical, the heat must be considerable, and produce summer; but when he is removed to the other tropic by a distance of 47 degrees, his rays will strike but faintly, and winter will be the consequence. The intermediate spaces, while he is moving from one tropic to the other, make spring and autumn.
[18.] The brothers.]—Ver. 60. That is, the winds, who, according to the Theogony of Hesiod, were the sons of Astreus, the giant, and Aurora.
[19.] Eurus took his way.]—Ver. 61. The Poet, after remarking that the air is the proper region of the winds, proceeds to take notice that God, to prevent them from making havoc of the creation, subjected them to particular laws, and assigned to each the quarter whence to direct his blasts. Eurus is the east wind, being so called from its name, because it blows from the east. As Aurora, or the morning, was always ushered in by the sun, who rises eastward, she was supposed to have her habitation in the eastern quarter of the world; and often, in the language of ancient poetry, her name signifies the east.
[20.] The realms of Nabath.]—Ver. 61. From Josephus we learn that Nabath, the son of Ishmael, with his eleven brothers, took possession of all the country from the river Euphrates to the Red Sea, and called it Nabathæa. Pliny the Elder and Strabo speak of the Nabatæi as situated between Babylon and Arabia Felix, and call their capital Petra. Tacitus, in his Annals (Book ii. ch. 57), speaks of them as having a king. Perhaps the term ‘Nabathæa regna’ implies here, generally, the whole of Arabia.
[21.] Are bordering upon Zephyrus.]—Ver. 63. The region where the sun sets, that is to say, the western part of the world, was assigned by the ancients to the Zephyrs, or west winds, so called by a Greek derivation because they cherish and enliven nature.
[22.] Boreas invaded Scythia.]—Ver. 64. Under the name of Scythia, the ancients generally comprehended all the countries situate in the extreme northern regions. ‘Septem trio,’ meaning the northern region of the world, is so called from the ‘Triones,’ a constellation of seven stars, near the North Pole, known also as the Ursa Major, or Greater Bear, and among the country people of our time by the name of Charles’s Wain. Boreas, one of the names of ‘Aquilo,’ or the ‘north wind,’ is derived from a Greek word, signifying ‘an eddy.’ This name was probably given to it from its causing whirlwinds occasionally by its violence.
[23.] The drizzling South Wind.]—Ver. 66. The South Wind is especially called rainy, because, blowing from the Mediterranean sea on the coast of France and Italy, it generally brings with it clouds and rain.
[24.] The forms of the Gods.]—Ver. 73. There is some doubt what the Poet here means by the ‘forms of the Gods.’ Some think that the stars are meant, as if it were to be understood that they are forms of the Gods. But it is most probably only a poetical expression for the Gods themselves, and he here assigns the heavens as the habitation of the Gods and the stars; these last, according to the notion of the Platonic philosophers being either intelligent beings, or guided and actuated by such.
[25.] Inhabited by the smooth fishes.]—Ver. 74. ‘Cesserunt nitidis habitandæ piscibus;’ Clarke translates ‘fell to the neat fishes to inhabit.’