Note 349 — Chapter III · THE CONTRIBUTION OF THE MOSLEMS

See the German translation in Friedrich Dieterici’s Die Philosophie der Araber im ix. und x. Jahrhundert n. Chr., vol. v, Leipzig, 1876. The “Brothers of Piety and Sincerity” made some noteworthy contributions 395to the science of geographical meteorology, but these were not passed on to the Western world. They understood, among other phenomena, the warming of the atmosphere by radiation from the earth’s surface and its connection with the angle of incidence of the sun’s rays; the influence of mountains upon precipitation; and the origin of springs and rivers (Hellmann, Denkmäler, 1904, pp. (18), 23–41).