ARABIA. -- HUMBERD, Jean Pierre Louis. Discourse sur l'utilité de la langue arabe, Prononcé le 16 juin 1823 aux promotions du Collège de Genève. Geneva: Guille. Fick, 1823. Original paste-paper wrappers. FIRST EDITION. – PALGRAVE, William Gifford. Narrative of a Year’s Journey through Central and Eastern Arabia. London and Cambridge: Macmillan and Co., 1865. 2 volumes, 8°. Engraved folding map hand-colored in outline, numerous engraved plates. Contemporary half calf, spines gilt, red and green morocco lettering-pieces. Provenance: Armorial bookplate with motto “Auspicium Melioris Aevi”. FIRST EDTION of Palgrave’s journey through Central and Eastern Arabia “with the purpose of observing rather than publishing.” – DOUGHTY, Charles Montagu. Travels in Arabia Deserta. London: Jonathan Cape, 1936. 2 volumes, 4°. Numerous illustrations. Original gold-stamped cloth. Provenance: Ralph Smith (bookplate). “New and definitive edition” with an introduction by T.E. Lawrence. – Together, 3 works in 5 volumes, condition generally good.