17 ' treatise has a particular name. • in the Mizan, which is reputed among the naskhs, it is stated, that the materials of the world existed from the very begin- ning, which signifies from the first appearance of afrdd, " rudimental units (monades?)/' which are primordial, that is to say, the root of the before-said state, until the time when these rudimental units, tempered together, became vegetables; thence rose animals, which are called dabtah ul ares, " the rep- " tiles of the world.'7 Thus it existed until man was formed. The first mentioned state might have extended to sixteen thousand years ; so that eight thousand years of the said number may be the period of Arabia, which is the superior, and eight thousand years the period of Ajerii (Persia), which is the infe- rior period. In the sequel, when the said world, which is the era of the first mentioned rudimental units, had been so constituted as to admit the form- ation of man; then the duration of life, comprising the period of man, was to be also sixteen thousand years; of which eight thousand years should revolve for eight perfect prophets of Arabia, and other eight thousand years for eight perfect teachers of Ajem. Further, when the cycle of the two formations shall be completed, then the turn of the fundamental units is to reappear. After twice the said eight thousand, that is, sixteen thousand years, according to simple computation, when a perfect cycle of mankind and