Seyid Mahommed's work was carried on uninterruptedly by his son, usually known as Sennussi-el-Mahdi. The manner in which this son gained his succession typifies the Sennussi spirit. Seyid Mahommed had two sons, El Mahdi being the younger. While they were still mere lads, their father determined to put them to a test, to discover which of them had the stronger faith. In presence of the entire Zawia he bade both sons climb a tall palm-tree, and then adjured them by Allah and his Prophet to leap to the ground. The younger lad leaped at once and reached the ground unharmed; the elder boy refused to spring. To El Mahdi, "who feared not to commit himself to the will of God," passed the right to rule. Throughout his long life Sennussi-el-Mahdi justified his father's choice, displaying wisdom and piety of a high order, and further extending the power of the fraternity. During the latter part of his reign he removed his headquarters to the oasis of Jowf, still farther into the Lybian desert, where he died in 1902, and was succeeded by his nephew, Ahmed-el-Sherif, the present head of the Order, who also appears to possess marked ability. With nearly eighty years of successful activity behind it, the Sennussi Order is to-day one of the vital factors in Islam. It counts its adherents in every quarter of the Moslem world. In Arabia its followers are very numerous, and it profoundly influences the spiritual life of the holy cities, Mecca and Medina. North Africa, however, still remains the focus of Sennussism. The whole of northern Africa, from Morocco to Somaliland, is dotted with its Zawias, or lodges, all absolutely dependent upon the Grand Lodge, headed by The Master, El Sennussi. The Sennussi stronghold of Jowf lies in the very heart of the Lybian Sahara. Only one European eye[33] has ever seen this mysterious spot. Surrounded by absolute desert, with wells many leagues apart, and the routes of approach known only to experienced Sennussi guides, every one of whom would suffer a thousand deaths rather than betray him, El Sennussi, The Master, sits serenely apart, sending his orders throughout North Africa. The influence exerted by the Sennussiya is profound. The local Zawias are more than mere "lodges." Besides the Mokaddem, or Master, there is also a "Wekil," or civil governor, and these officers have discretionary authority not merely over the Zawia members but also over the community at large--at least, so great is the awe inspired by the Sennussiya throughout North Africa, that a word from Wekil or Mokaddem is always listened to and obeyed. Thus, besides the various European colonial authorities, British, French, or Italian, as the case may be, there exists an occult government with which the colonial authorities are careful not to come into conflict.