So soon as the discoveries made by Lander became known in England, several merchants formed themselves into a company for developing the resources of the new districts. In July, 1832, they equipped two steamers, the _Quorra_ and _Alburka_, which, under the command of Messrs. Laird, Oldfield, and Richard Lander, appended the Niger as far as Bocqua. The results of this commercial expedition were deplorable. Not only was there absolutely no trade to be carried on with the natives, but the crews of the vessels were decimated by fever. Finally, Richard Lander, who had so often gone up and down the river, was mortally wounded by the natives, on the 27th January, 1834, and died on the morning of 5th February, at Fernando Po. To complete our account of the exploration of Africa during the period under review, we have still to speak of the various surveys of the valley of the Nile, the most important of which were those by Cailliaud, Russegger, and Ruppell. Frederic Cailliaud was born at Nantes in 1787, and arrived in Egypt in 1815, having previously visited Holland, Italy, Sicily, part of Greece, and European or Asiatic Turkey, where he traded in precious stones. His knowledge of geology and mineralogy won for him a cordial reception from Mehemet Ali, who immediately on his arrival commissioned him to explore the course of the Nile and the desert. This first trip resulted in the discovery of emerald mines at Labarah, mentioned by Arab authors, which had been abandoned for centuries. In the excavations in the mountain Cailliaud found the lamps, crowbars, ropes, and tools used in working these mines by men in the employ of Ptolemy. Near the quarries the traveller discovered the ruins of a little town, which was probably inhabited by the ancient miners. To prove the reality of his valuable discovery he took back ten pounds' weight of emeralds to Mehemet Ali. Another result of this journey was the discovery by the French explorer of the old road from Coptos to Berenice for the trade of India. From September, 1819, to the end of 1832, Cailliaud, accompanied by a former midshipman named Letorzec, was occupied in exploring all the known oases east of Egypt, and in tracing the Nile to 10 degrees N. lat. On his first journey he reached Wady Halfa, and for his second trip he made that place his starting-point. A fortunate accident did much to aid his researches. This was the appointment of Ismail Pacha, son of Mehemet Ali, to the command of an expedition to Nubia. To this expedition Cailliaud attached himself. Leaving Daraou in November, 1820, Cailliaud arrived, on the 5th January in the ensuing year, at Dongola, and reached Mount Barka in the Chaguy country, where are a vast number of ruins of temples, pyramids, and other monuments. The fact of this district bearing the name of Merawe had given rise to an opinion that in it was situated the ancient capital of Ethiopia. Cailliaud was enabled to show this to be erroneous.