The timber of species of _Cedrela_ and _Melia_, other members of the order _Meliaceae_, are used as Mahogany, and the product of the West African _Khaya senegalensis_ is known as African mahogany. There is some confusion between the product of these various trees. Herbert Stone (_The Timbers of Commerce_, 1904) says: "The various species of mahogany and cedar are so confusing that it is difficult to make precise statements as to their structure or origin. I know of no convincing proof that any of the American kinds met with on the English market are the wood of _Swietenia Mahogani_, nor that those shipped from Africa are the wood of _Khaya senegalensis_. These two genera are very nearly allied to _Cedrela_ and _Melia_, and it is difficult to separate any of the four from the rest by the characters of the wood. After giving the most careful attention to every detail, I lean to the view that most if not all of the mahoganies commonly met with are Cedrelas." _Kiggelaria Dregeana_ (natural order _Bixineae_), a native of South Africa, is known as Natal mahogany. MAHOMET (strictly MUHAMMAD, commonly also MOHAMMED), founder of the religious system called in Europe after him Mahommedanism, and by himself Islam or Hanifism. He died, according to the ordinary synchronism, on the 7th of June 632 (12 Rabia, A.H. 11), and his birthday was exactly sixty-three or sixty-five years earlier, the latter number being evidently an interpretation in lunar years of a number thought to refer to solar years. The lunar system was introduced into Arabia by Mahomet himself quite at the close of his career; that which existed before was certainly solar, as it involved a process of intercalation--which, however, seems to have been arbitrarily manipulated by priests, whence certain synchronisms cannot be got for the events in the Prophet's career. The number 63 for the years of his life may rest on tradition, though it is unlikely that such matters were accurately noted; it can also be accounted for by a priori combination. A Meccan, it is said, became a full citizen at the age of 40; this then would be the age at which the mission might be started. The Medina period (of which count was kept) lasted ten to eleven years; for the Meccan period ten years would seem a likely length. Finally it was known that for some years--about three--the mission had been conducted secretly. The only event in contemporary history to which the Koran alludes in its earlier parts is the Persian conquest of Palestine in 616. Clearly Mahomet had begun to prophesy at that date. His Country.