In consequence of the appointment which Mungo Park had obtained as surgeon in the East India Company's service, by the interest of Sir Joseph Banks, he sailed for the East Indies in the Worcester in the month of February, 1792; and having made a voyage to Bencoolen, in the island of Sumatra, returned to England in the following year. Nothing material occurred during this voyage: but he availed himself of all the opportunities which it afforded to obtain information in his favourite scientific pursuits, and appears to have made many observations, and collected many specimens, in Botany and Natural History. Several of these were the subjects of a communication made by him to the Linnæan Society, which was afterwards published in their printed Transactions. [Footnote: In the Third Volume of the Linnæan Transactions, p. 83, is a paper by Park, read Nov. 4,1794, containing descriptions of eight new fishes from Sumatra; which he represents to be the fruit of his leisure hours during his stay on that coast.]
It does not sufficiently appear, whether Mr. Park, after his return from the East Indies, came to any final resolution with regard to his continuing as a surgeon in the Company's service. But whatever might be his intention in this respect, new prospects now opened upon him, and a scene of action far more congenial to his taste and feelings, was presented to his ambition.
Some years prior to this period, a few distinguished individuals, induced by a very liberal spirit of curiosity, had formed themselves into an Association for promoting discoveries in the Interior of Africa, and were now prosecuting their researches with great activity and success. In the course of a few years they had investigated, and placed in a clearer point of view than had hitherto been done by geographers, some of the leading facts relative to the Northern part of that Continent; the characteristic differences of the principal tribes, their commercial relations, the routes of the great caravans, the general diffusion of the Mahomedan religion, and the consequent prevalence of the Arabic language throughout a considerable part of that vast continent. [Footnote: See Vol. I. of the Proceedings of African Association. London, 1810.] With the assistance of their distinguished Associate, Major Rennell, they were now proceeding to trace the principal geographical outlines of Northern Africa; and were endeavouring to ascertain the course of the great inland river Joliba or Niger, and to obtain some authentic information concerning Tombuctoo, a principal city of the interior and one of the great marts of African commerce.
In the course of these enquiries, the Association, since their first establishment in 1788, had employed several persons, well qualified for such undertakings, upon missions into various parts of the African Continent. Several of these were known to have perished, either as victims of the climate, or in contests with the natives; [Footnote: The persons who had been sent out prior to this period, were Mr. Ledyard, Mr. Lucas, Major Houghton, and Mr. Horneman: subsequently to which, several others have been employed; viz. Mr. Nichols, Mr. Bourcard, &c.] and intelligence had lately been received of the death of Major Houghton, who had been sent out to explore the course of the Niger, and to penetrate, if possible, to Tombuctoo and Houssa. The Association appear to have found considerable difficulty in supplying Major Houghton's place; and had made known their readiness to give a liberal compensation to any person, competently qualified, who might be willing to proceed on this important and arduous mission.
The attention of Park was naturally drawn to this subject, in consequence of his connection with Sir Joseph Banks, who had received him with great kindness and cordiality on his return from the East Indies, and with whom he was now in habits of frequent intercourse. Sir Joseph Banks was one of the most active and leading members of the African Association, and with his accustomed zeal for the promotion of scientific discovery, was earnest in his endeavours to find out a proper person to undertake the mission in search of the Niger. There was nothing in Park's previous studies which had particularly led him towards geographical pursuits; but he had a general passion for travelling; he was in the full vigour of life; his constitution had been in some degree inured to hot climates; he saw the opportunities which a new country would afford of indulging his taste for Natural History: nor was he insensible to the distinction which was likely to result from any great discoveries in African geography. These considerations determined him. Having fully informed himself as to what was expected by the Association, he eagerly offered himself for the service; and after some previous enquiry into his qualifications, the offer was readily accepted.
Between the time of Park's return from India in 1793, and his departure to Africa, an interval elapsed of about two years. During the whole of this period (with the exception of a short visit to Scotland in 1794), he appears to have resided in London or its neighbourhood; being engaged partly in his favourite studies, or in literary or scientific society; but principally in acquiring the knowledge and making the preparations, which were requisite for his great undertaking.
Having received his final instructions from the African Association, he set sail from Portsmouth on the 22d of May, 1795, on board the Endeavour, an African trader, bound for the Gambia, where he arrived on the 21st of the following month. It is not the intention of this narrative to follow him through the details of this journey, a full account of which was afterwards published by Park, and is familiar to every reader. But it may be useful to mention the material dates and some of the principal transactions.
Having landed on the 21st of June at Jillifree, a small town near the mouth of the River Gambia; he proceeded shortly afterwards to Pisania, a British factory about 200 miles up the same river, where he arrived on the 5th of July, and was most hospitably received by Dr. Laidley, a gentleman who had resided many years at that settlement. He remained at Dr. Laidley's house for several months, in order to learn the Mandingo language, which is in general use throughout that part of Africa, and also to collect information concerning the countries he intended to visit. During two of these months he was confined by a severe fever, caught by imprudently exposing himself during the rainy season.
He left Pisania on the 2d of December, 1795, directing his course easterly, with a view of proceeding to the River Joliba, or Niger. But in consequence of a war between two sovereigns in the Interior, he was obliged, after he had made some progress, to take a northerly direction towards the territory of the Moors. He arrived at Jarra, the frontier town of that country, on the 18th of February, 1796. Pursuing his journey from thence, he was taken and detained as a prisoner, by Ali, the chieftain or king of that territory, on the 7th of March; and after a long captivity and a series of unexampled hardships, escaped at last with great difficulty early in the month of July.
The period was now approaching when he was to receive some compensation for so many sufferings. After wandering in great misery for about three weeks through the African Wilderness, he arrived at Sego, the capital of Bambarra, a city which is said to contain thirty thousand inhabitants. He was gratified at the same time by the first sight of the Niger, the great object of his journey; and ascertained the extraordinary fact, that its course is from West to East.