Read in this order, the Ḳur-án is an unintelligible jumble. Carlyle may well say that ‘nothing but a sense of duty could carry any European through the Ḳur-án.’ You can trace no development of mind or doctrine in the present arrangement; it is indeed a confused mass of ‘endless iterations, long-windedness, entanglement, most crude, incondite.’ But scholars have long discovered certain signs of a true order—several kinds of evidence by which a chronological arrangement of the Ḳur-án may be attempted. These are—(1.) The _references to historical events_ in the Ḳur-án, as identified by tradition. These, however, are but few, and occur chiefly in quite the latest soorahs; and tradition is apt to identify any reference with any event it chooses. A much more important test is (2.) the _style_; for a distinct development can be traced in the rime, in the length of verses, and in the words employed. And then there is (3.) the _matter_ test, based on what we know of Moḥammad’s life, from which we can argue a certain change in his preaching at Mekka, and still more when, from addressing idolaters in his birthplace, he came to preach to Jews and Christians at Medina. The danger of this last test is that each man forms his own theory of Moḥammad’s mental and religious growth, and may arrange the soorahs in accordance with that theory. Even with these three tests, used by the most accomplished critics, it is impossible to arrive at an exact order, and to determine the precise chronological position of each soorah. But whilst it is admitted that an exact chronological arrangement of each individual chapter of the Ḳur-án is impossible, it is yet no less certain that the soorahs may be roughly grouped together, and that these groups can be definitely assigned to certain periods of Moḥammad’s career. Professor Th. Nöldeke’s _Geschichte des Qorâns_ has established his right to the first place in this science of Ḳur-án arrangement, and his order of soorahs may fairly be accepted as authoritative. Of this order Mr. Rodwell’s English version of the Ḳur-án is an example, except that a few of the earliest soorahs are transposed. Nöldeke has two great divisions of the soorahs: those revealed at Mekka, and those revealed during the Medina period. Further, he divides the Mekkan division into three groups.[23] { I. A.D. 612-617 (Rodwell, pp. 1-64)—To the Abyssinian { exile (fifth year). { { II. A.D. 617-619 (Rodwell, pp. 64-192)—Fifth and sixth Mekka { years of Moḥammad’s mission. { { III. A.D. 619-622 (Rodwell, pp. 193-366)—From the { seventh year to the Flight. Medina A.D. 622-633 (Rodwell, pp. 366-555)—At Medina.