[640] “Βαθέα Ponti;” Aristotle refers to this as one of those parts where the sea is unfathomable; Meteor. i. 13. [641] A distance of nearly nine and a half miles. [642] The specific gravity of sea water varies from 1·0269 to 1·0285. The saline contents of the water of the English Channel are stated to be 27 grs. in 1000. Turner’s Chem. p. 1289, 1290. [643] The modern names of the rivers and lakes here mentioned are the Liris, communicating with the Lago di Celano; the Adda, with the Lago di Como; the Ticino, with the Lago Maggiore; the Mincio, with the Lago di Guarda; the Oglio, with the Lago di Sero; and the Rhone with the Lake of Geneva. There may be some foundation for the alleged fact, because the specific gravity and the temperature of the lake may differ a little from that of the river which passes through it. [644] According to Brotier, “fons ille olim nobilissimus, nunc ignobile est lavacrum, cujus aqua marino sapore inficitur.” He conceives that there is no actual foundation for this so frequently repeated story; and conjectures that it originated from the similitude of the names, the fountain in Sicily and the river in the Peloponnesus being both named Alpheus. He goes on to mention some examples of springs of fresh water rising up on the sea-coast; Lemaire, i. 438. The allusion to the fountain of Arethusa, by Virgil, in the commencement of the 10th eclogue, is well known to all classical scholars. The lines of Virgil have been elegantly imitated by Voltaire, in the Henriade, ix. 269, 270. [645] This is mentioned by Ovid, Met. xv. 273, 274. [646] This is again referred to by our author, vi. 31; also by Strabo, and by Seneca, Nat. Quæst. iii. 26. [647] Pausanias. [648] The river here referred to is the Tanager, the modern Rio Negro. See the remarks of Hardouin and Alexandre in Lemaire, i. 439. [649] From a note in Poinsinet, i. 302, we learn that there has been some doubt respecting the locality of this river. It is mentioned by Virgil, Æn. i. 244, and it forms the subject of Heyne’s 7th Excursus, ii. 124 _et seq._ Virgil also speaks of the Timavus, Ec. viii. 6; and Heyne, in a note, gives the following description of it: “Timavus in ora Adriæ, non longe ab Aquileia fluvius ex terra novem fontibus seu capitibus progressus, brevi cursu, in unum alveum collectus, lato altoque flumine in mare exit.” i. 127, 128. [650] This remark is not to be taken in its full extent; the water of these lakes contains a large quantity of saline and other substances dissolved in it, and, consequently, has its specific gravity so much increased, that various substances float on it which sink in pure water. [651] According to Hardouin, this is now called the Lake of Andoria, near the town of Casalnuovo; Lemaire, i. 439. Poinsinet calls it Anduria, i. 303. [652] The petrifying quality of this river is referred to by Ovid, Met. xv. 313, 314; Seneca quotes these lines when treating on this subject, Nat. Quæst. iii. 20.