TRANSACTIONS OP THE SECTIONS. 99 



On the Construction of a Map of the Western portion of Central Africa^ 

 showing the probahility of the River Tchadda being the outlet of the 

 Lake Tchad. By Captain W. Allen, R. N. 



In this paper, the author gave a summary of the reasons, derived 

 from Arabic as well as modern authorities, and from his own personal 

 experience on the river Quorra, as to the possibility if not probability 

 of the course of the river Tchadda having been mistaken ; and that in- 

 stead of flowing from west to east, as represented by Denham, that it 

 flows from east to west and joins the rivers Shary and Quorra, thereby 

 affording water communication to the interior of central Africa. 



On the recently-determined Position of the City of Cuzco in Peru. 

 By J. B. Pentland, Esq. A. M. Consul', n Bolivia. Communicated 

 by Captain Beaufort, Royal Navy, Hydrographer to the Ad- 

 miralty. 



We learn from this brief notice that the position of the ancient tem- 

 ple of the Sun at Cuzco is in 13° 30' 55" south latitude, 72° 4' 10" 

 west longitude, differing full 45 miles from its position in our present 

 maps ; and that it stands at an elevation of 11,380 feet above the level 

 of the sea. Mr. Pentland has also determined the positions of all 

 principal places between La Paz and Cuzco, and of the western shores 

 of the great inter-alpine lake of Titicaca. 



On the recent Ascent of the River Euphrates. By Lieutenant Lynch. 

 Communicated by Lieutenant- Colonel Chesney, Royal Artillery. 



This letter, dated Hit, June 1, 1838, described the facility with 

 which the steamer had ascended the river from Basrah to that place. 

 Between Hillah and Hit, it speaks of a broad, deep, and beautiful 

 stream, in some of the bends nearly a mile wide ; the country extremely 

 fertile; the crops of corn abundant, and just reaped ; the population of 

 Arabs along the banks extensive, and apparently happy, welcoming 

 the approach of the steamer with shouting and dancing, and supplying 

 their want of fuel with great readiness and cordiality. The produc- 

 tions of the country, as wool, naphtha, bitumen, ghi (or butter), tallow, 

 corn in abundance, and horses of the finest breed, are mentioned as 

 easy to be obtained, and in large quantities ; and the letter concludes 

 with an expression of the writer's conviction that a profitable trade 

 might easily be established ; and, after the experience he has had of the 

 river, that there are no physical obstacles to its free navigation with 

 properly constructed vessels. 



An explanation was then given of maps which were exhibited, and 

 particularly of that showing the line of levels carried between the 

 Mediterranean at Iskenderun, and the river Euphrates at Birehjik, 

 whence it appears that the city of Antioch is situated 300 feet above the 

 sea; the town of Birehjik, 628 feet ; and the highest point between the 

 sea and the river rises 1720 feet above the Mediterranean. 



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