Contents: Pythagoras, His Tenets and His Followers; Pythagorean Views on Numbers; Kabalistic View on Numbers; Properties of the Numbers According to the Bible, the Talmuds, the Pythagoreans, the Romans, Chaldeans, Egyptians, Hindoos, Medi val Magicians, Hermetic Students and the Rosicrucians: Monad, Dyad, Triad, Three and a Half, Tetrad, Pentad, Hexad, Heptad, Ogdoad, Ennead, Decad, Eleven, Twelve, Thirteen; Some Hindoo Uses of Numbers; Other Higher Numbers; Numbers of the Apocalypse.