[Footnote 3: _Voyage à Méroé, au Fleuve Blanc, an-delà de Fàzogl dans le midi du Royaume de Sennàr, à Syouah et dans cinq autres Oasis._ Paris, 1826. The work consists of four volumes, accompanied by numerous maps and plates illustrating the antiquities.] [Footnote 4: _Relation d’un voyage dans la Marmarique, la Cyrénaique et les Oasis d’Audjelah et de Maradèh_. Paris, 1827. (This date is probably wrong, as a reference is made in the work, (p. VII) to the suicide of Pacho on Jan. 26th, 1829).] [Footnote 5: _Modern Egypt and Thebes_. London, 1843, vol. II, p. 357-371.] [Footnote 6: See G. ROHLFS, _Drei Monate in der libyschen Wüste_, Cassel, 1875; JORDAN, _Physische Geographie und Meteorologie der libyschen Wüste_, Cassel, 1876; and ZITTEL, _Geologie der libyschen Wüste_. Cassel, 1883. Jordan appears to have been the only member of the Rohlfs’ party to actually visit Baharia. He left the other members at Lake Sittra (N. lat. 28° 42′ 40″, long. 27° 4′ 23″, E. of Green.) and entered Baharia from the N.W. of El Qasr; after passing about 1½ days in Baharia Oasis he journeyed southwards via Farafra to rejoin his colleagues in Dakhla.] [Footnote 7: _Zeitschrift der Gesellschaft für Erdkunde zu Berlin_, Band 20, Heft II, 1885. Also Dr. Schweinfurth’s summary of Ascherson’s results in “Petermann’s Mittheilungen,” 22. Band, 1876, p. 264.] [Footnote 8: _On the Stratigraphy and Physiography of the Libyan Desert of Egypt. Q. J. G. S._ Nov, 1894, pp. 531-547.] [Footnote 9: _Vorlaüfiger Bericht über seine im Winter 1899-1900 nach der Oase Siwa und nach Nubien unternommenen Reisen_.—Königl. Sächs. Gesellschaft der Wissenschaften zu Leipzig, 1900, p. 226. Steindorff entered the Oasis from Siwa, and returned from it via the Fayum. He appears only to have visited the northern part of Baharia.] CHAPTER II. * * * * * SURVEYING METHODS AND GENERAL RESULTS. Crossing the Libyan Desert from Maghagha and Minia respectively, the two parties of the Geological Survey met at a joint camp close to Zubbo, one of the chief villages of the oasis. It was desirable to fix this meeting-point as a primary station for the subsequent plotting of the maps. Cailliaud[10] gave the latitude of Zubbo as 28° 21′ 47″, and its longitude as 26° 43′ 46″ E. of Paris, (equivalent to 29° 3′ 55″ E. of Greenwich). Jordan gave for Bawitti the position N. lat. 28° 21′ 12″, long. E. of Greenwich 28° 56′ 45″. Taking the difference of latitude and longitude between Bawitti and Zubbo as found by the Survey, viz., lat. + 55″, long. + 4′ 16″, we have as the equivalent of Jordan’s latitude for Zubbo 28° 22′ 7″, and for his longitude 29° 1′ 1″ E. of Greenwich. Thus, while there is a fair agreement between the two authors as regards latitude, there is a difference of 2′ 54″ in the values of the longitude.