1154), the famous work, best known, from its patron and originator, as _Al Rojari_, but whose fullest title seems to have been, _The going out of a Curious Man to explore the Regions of the Globe, its Provinces, Islands, Cities and their Dimensions and Situation_. This has been abbreviated to _The Amusement of him who desires to traverse the Earth_, or _The Relaxation of a Curious Mind_. The title of _Nubian Geography_, based upon Sionita and Hezronita's misreading of a passage relating to Nubia and the Nile, is entirely unwarranted and misleading. The _Rogerian Treatise_ contains a full description of the world as far as it was known to the author. The "inhabited earth" is divided into seven "climates," beginning at the equinoctial line, and extending northwards to the limit at which the earth was supposed to be rendered uninhabitable by cold. Each climate is then divided by perpendicular lines into eleven equal parts, beginning with the western coast of Africa and ending with the eastern coast of Asia. The whole world is thus formed into seventy-seven equal square compartments. The geographer begins with the first part of the first climate, including the westernmost part of the Sahara and a small (north-westerly) section of the Sudan (of which a vague knowledge had now been acquired by the Moslems of Barbary), and thence proceeds eastward through the different divisions of this climate till he finds its termination in the Sea of China. He then returns to the first part of the second climate, and so proceeds till he reaches the eleventh part of the seventh climate, which terminates in north-east Asia, as he conceives that continent. The inconveniences of the arrangement (ignoring all divisions, physical, political, linguistic or religious, which did not coincide with those of his "climates") are obvious.