Generations of Noah are now seen as belonging to several distinct families independent of the Afro-Asiatic group. Some now discarded Hamitic theories have become viewed as racist; in particular a theory proposed in the 19th century by Speke, that the Tutsi were supposedly of some Hamitic ancestry and thus "inherently superior". The 17th-century Jesuit, Athanasius Kircher, thought that the Chinese had also descended from Ham, via Egyptians. There exist various traditions in post-biblical and talmudic sources claiming that Noah had children other than Shem, Ham, and Japheth who were born before the Deluge. According to the Quran ("Hud" 42–43), Noah had another unnamed
Shem-Tob ben Isaac of Tortosa the four seasons of the year. According to the superstitions of his time, he believed in the influence of the planets on man; and accordingly an entire treatise deals with astrology. His translation was undertaken with the view of spreading medical science among the Jews, so that they might not be dependent on Christian physicians (comp. 'Ab. Zarah ii.2). The translation is not literal; and in this Shem-Ṭob departed from the method of the earlier translators. As to the various names of diseases and medicaments, Shem-Ṭob employs all that he could find in the Bible and in Talmudic literature. Others