[Footnote 2: This statement may not absolutely apply to Cairo itself, seeing that in the disturbed region of Abu Roash sandstone is actually at the surface, and the clays are less conspicuously developed than is the case to the south.] [Footnote 3: Figs. 1, 2 and 4 are based on photographs of localities in Great Britain and Ireland taken for the Geologists’ Association collection of photographs.] [Footnote 4: Farafra is an exception to this rule, the depression being due to the wearing away of soft Cretaceous beds higher than the sandstone.] [Footnote 5: The well-known Petrified Forests.] [Footnote 6: From information given by Mr. Harding King.] [Footnote 7: At Abu Radham a dark layer of purple iron ochre seems to have been the cause of the investigation.] [Footnote 8: For further details, see my paper “Petroleum: Its occurrence and origin,” Cairo Scientific Journal, No. 48, pp. 205-218.] [Footnote 9: “The Natural History of Igneous Rocks,” p. 23.] SHORT CATALOGUE OF THE =MAPS, PLANS, AND PUBLICATIONS= ISSUED BY THE SURVEY DEPARTMENT, MINISTRY OF FINANCE, EGYPT. * * * * * =MAPS AND PLANS.= * * * * * The following is a general list of the maps and plans offered for sale by the Survey Department. A booklet giving details of all sheets printed may be obtained free, on application either personally or by letter at the Headquarters of the Department, Giza (Mudiria), or at the Geological Museum, Public Works Ministry Gardens, Cairo, where all maps and plans are for sale, or through any bookseller. Except where specially stated, the price of each map-sheet is 50 milliemes on paper, and 65 milliemes on cloth, and they are sent post free by the Department. The reference marks denote: (*) map is in Arabic only; (†) map is in English only; (*†) map bears place-names both in Arabic and English; (*) (†) map can be obtained either in Arabic or English. =Town Maps.= The following list gives particulars of the maps published. The map of Alexandria, on the scale of 1:1,000 will be completed during 1911. The survey of Cairo on the scale of 1:1,000 is in progress. Cairo (*†), 30 sheets, scale 1:1,000 (in preparation). Alexandria (*†), 147 sheets, scale 1:1,000. General map of Alexandria Municipality (French and Arabic), 10 sheets, scale 1:6,000. Mit Ghamr (*†), 4 sheets, scale 1:1,000. Mansura (*†), 16 sheets, scale 1:1,000. Suez (*†), 20 sheets, scale 1:1,000. Suez (*†), 1 sheet, scale 1:2,500. Sohag (*†), 6 sheets, 1:1,000. Tanta (*†), 15 sheets, scale 1:1,000. Girga (*†), 6 sheets, scale 1:1,000. Aswan (*†), 23 sheets, scale 1:1,000. Port Said (in French), 1 sheet, scale 1:5,000. Zagazig (*†), 20 sheets, scale 1:1,000. Damanhur (*†), 14 sheets, scale 1:1,000.