IBN RIDWAN (about 1050 A.D.)
Abū-l-Hasan Alī Ibn Riḍwān. An Egyptian physician who wrote a treatise on Medicine. Daf’ madārr al-abdān bi-ard Miṣr MS.: Cairo, Dar al-Kutub, MS 18, quoted by Maqrizi (Wiet I, 1, p. 186).
T. : MC 726 r A:1
Burning heat and drought are predominant characteri¬stics of the climate of this place (i.e. Aswan), because the sun heat absorbs all the humidity. For this reason also the local population has a black complexion and kinky hair because of the burning heat of their land. (MC 726 r.).