[2016]. Strab. xii. t. ii. p. 814. Plin. Nat. Hist. xxxvi. 45.
[2017]. Plin. Nat. Hist, xxxvii. 25. Theoph. de Lapid. § 19. On which see the note of Sir John Hill, p. 76.
[2018]. Γαγάτης. Dioscor. v. 146. Plin. Nat. Hist. xxxvi. 34. Aldrovand. de Metall. iii. 19. Scalig. de Subtilitat. Exercit. civ. 3, p. 383. Florent. ap. Geopon. viii. 8. Orpheus, de Lapid. 468.
[2019]. Martin Mathée, Notes sur Dioscoride, p. 503.
[2020]. Valmont de Bomare, Dictionnaire d’Histoire Naturelle, t. iii. p. 414. Anselm. Boet. Gemm. et Lapid. Hist. ii. 164, p. 336, observes, that jet is sometimes found in Britain, and our antiquarian, Camden, speaks of its being sometimes dug up from pits near Okewood in Surrey. Britannia, col. 163.
[2021]. Theoph. de Lapid. § 47. Dioscor. v. 111.
[2022]. Sir John Hill, Notes on Theophrast. p. 190, seq.
[2023]. Plat. Tim. t. vii. p. 118. Plin. Nat. Hist. xxxvi. 45.
[2024]. Theoph. de Lapid. § 58.
[2025]. Dioscor. v. 123. The alum also of Egypt appears to have been extensively exported, and held in high estimation by Physicians. Celsus, v. 38. 12.