black or red, or fire, inauspicious.--The distinction of fortunate and unfortunate days should also here be mentioned. Thursday and Friday, especially the latter, are considered fortunate; Monday and Wednesday, doubtful; Sunday, Tuesday, and Saturday, especially the last, unfortunate. It is said that there are seven evil days in every [lunar] month; namely, the third, on which Ḳábeel (or Cain) killed Hábeel (Abel); the fifth, on which God cast down Adam from paradise, and afflicted the people of Yoonus (Jonas), and on which Yoosuf (or Joseph) was cast into the well; the thirteenth, on which God took away the wealth of Eiyoob (or Job), and afflicted him, and took away the kingdom from Suleymán (or Solomon), and on which the Jews killed the prophets; the sixteenth, on which God exterminated and buried the people of Looṭ (or Lot), and transformed three hundred Christians into swine, and Jews into apes, and on which the Jews sawed asunder Zekereeyà (or Zachariah); the twenty-first, on which Pharaoh was born, and on which he was drowned, and on which his nation was afflicted with the plagues; the twenty-fourth, on which Numrood[136] (or Nimrod) killed seventy women, and cast El-Khaleel (or Abraham) into the fire, and on which was slaughtered the camel of Ṣáleḥ; and the twenty-fifth, on which the suffocating wind was sent upon the people of Hood.[137] II. Natural magic, which is called "es-Seemiyà," is regarded by most persons of the more enlightened classes of Muslims as altogether a deceptive art, no more worthy of respect than legerdemain; but it seems to be nearly allied to enchantment; for it is said to effect, in appearance, the most wonderful transformations, and to cause the most extraordinary visions; affecting the senses and imagination in a manner similar to opium. This and other drugs are supposed, by some persons, to be the chief means by which such illusions are caused; and perfumes, which are generally burnt in these performances, may operate in a similar manner. As such things are employed in performances of the kind called "Ḍarb el-Mendel," before mentioned, these feats are regarded by many as effected by natural magic, notwithstanding what has been said above respecting the services of evil Jinn being procured by means of perfumes.--Alchymy ("el-Keemiyà") is a branch of natural magic. It is studied by many Muslims of the present day, and by some of considerable talents and attainments.