Mr. Jackson, indeed, in his Travels (p. 310), states it to be a fact universally known among the rich African traders, that the Niger and the Nile are one and the same river, by means of which there is a practicable communication between Tombuctoo and Grand Cairo. Between these two cities caravans are continually passing, and a large trade is carried on; but Mr. Jackson observes, that the expense of land-carriage by means of camels is more moderate than that by water, and that the journey also is more agreeable! He gives an account of the voyage to Cairo down the Niger, having actually been performed in the year 1780 by a party of seventeen negroes, the particulars of which expedition, he says that he received from 'a very intelligent man who has an establishment at Tombuctoo.' These negroes proceeded down the Niger from Jinnie, on a commercial speculation, and reached Cairo after a voyage of fourteen months. They returned by the caravan, and arrived at Jinnie, after an absence of more than three years. Some of the facts which they reported are not a little extraordinary:—viz. that in several places they found the Nile so shallow, in consequence of channels cut for irrigating the lands, that they could not proceed in their boat, and were obliged to transport it some distance over-land; that they saw between Tombuctoo and Cairo twelve hundred cities and towns, adorned with mosques and towers, &c. It is needless to comment upon such hearsay statements, received from an African traveller or merchant more than twenty years after the transaction is said to have happened; nor would any allusion have been made to them in this place, if Mr. Jackson's book had not been much commended by distinguished critics, and quoted as an authority respecting the interior of Africa by several geographical writers.
[Footnote: Edinburgh Review, vol. xiv. p. 306.]
The principal, and apparently decisive, objection against this supposed junction of the Niger and the Nile, is grounded upon a comparison of the great difference of level between the beds of the two rivers. From the authentic information we possess by means of Mr. Browne, respecting the countries west of the Nile, it is now clear, that if this junction takes place at all, it must be in the upper part of the Nile, before that river has quitted the higher regions of Africa, from whence it has still 1000 geographical miles to run before it reaches the sea, passing in its way through several cataracts. But it is utterly incredible that the Niger, which, in order to reach this part of the Nile, must have run at the least 2300 miles, should not in so long a course have descended to a level considerably lower than that which is here described. This objection is urged with great force by Major Rennell, who justly considers it as being entirely decisive of the question; but he has added several other arguments, which those who take an interest in this question, will do well to consult.
[Footnote: Proceedings of the African Association, vol. i. p. 537; and vol. ii. p. 268, 280.]
III. The supposition, mentioned in the text (p. lxviii), that the Niger terminates in the River Congo, or, as it is sometimes called, the Zaire, is entirely a recent conjecture, adopted by Park in consequence of the information and suggestions of Mr. Maxwell, an experienced African trader, who appears from his letters to have been a man of observation and intelligence. The principal arguments in support of the opinion are shortly and clearly given in the memoir addressed by Park to Lord Camden; but the subject will receive additional elucidation from Mr. Maxwell's own statement, and especially from his striking description of the river Congo, the vast magnitude of which is little known, and has not sufficiently attracted the attention of geographical writers. The following passage is extracted from a letter, dated Prior's Lynn, near Longtown, July 20, 1804, addressed by Mr. Maxwell to William Keir, of Milnholm, Esq., a friend of Park, to whom the letter was communicated by Mr. Maxwell's desire.
"Before ever the Niger came to be the topic of conversation, it struck me, that the Congo drew its source far to the northward, from the floods commencing long before any rains take place south of the equator; since it begins to swell perceptibly about the latter end of October, and no heavy rains set in before December: and about the end of January the river must be supposed at its highest. At no time, however, can the rains to the southward of the Line be compared with those in the Bight of Guinea, where ships are obliged to have a house erected over them during these months.
"But, whether the Congo be the outlet of the Niger or not, it certainly offers the best opening for exploring the interior of Africa of any scheme that has ever yet been attempted; and the ease and safety with which it might be conducted, needs no comment. However, if the Niger has a sensible outlet, I have no doubt of its proving the Congo, knowing all the rivers between Cape Palmas and Cape Lopes to be inadequate to the purpose; nor need the immense course of such a river surprise us, when we know that the river St. Lawrence, contemptible in size when compared with the Congo, encompasses the whole of North America, issuing through a chain of lakes. But instead of seven or eight lakes, the Congo may be supposed to pass through seventeen or eighteen; which will solve any difficulty as to the floods of the Niger not immediately affecting the Congo. I believe that our information of the Niger losing itself in the Desert rests wholly upon the authority of the Romans, a people whose pursuits never led them to trace the course of rivers with a view to traffic or civilization. If we may credit the accounts of travellers in crossing the deserts, we find that, where-ever they get water for refreshment, there are invariably verdure and palm trees; and these spots in the desert of Lybia were termed by the ancients Oases, or Islands. Now, if such small springs could produce such permanent effects, we may reasonably suppose, that the immense stream of the Niger increased to three times the size from where Mr. Park left it, would long before this have made the desert as green as any water meadow and found its way gradually to the ocean, or inundated the whole country."
"I can with much truth say this of the river Congo, that by comparing it with other rivers, according to the best writers, it must rank as the third or fourth in magnitude. Considering the force of the current it produces in the sea, carrying out floating islands sixty or seventy leagues from the coast, the Amazon or Plata only can cope with it. Many traders, whom I met with at Embomma, (a settlement on the banks of the Congo distant thirty leagues from its mouth,) had come one month's journey down the river, which, reckoned at twenty miles each day (and they count them by the moon, Gonda), would make six hundred miles; and they spoke of it as equally large where they came from, and that it went by the name of Enzaddi, as it does among all the natives upon the coast. Should the shallow water, as laid down opposite Saenda, detract from the assumed size of the Congo, let it be remembered, that the river there is spread out ten miles in width, the middle channel of which has never been accurately sounded. It has long been my opinion that Leyland's or Molyneux Island at Embomma (either of which might be rendered as impregnable as Gibraltar at a very small expense) would be a choice station for establishing an extensive commerce with the interior of Africa. Indeed, if the idea of the Congo being the outlet of the Niger prove so upon trial, we may consider it as an opening designed by providence for exploring those vast regions, and civilizing the rude inhabitants."
[Footnote: A chart of the Congo by Mr. Maxwell was published many years since by Laurie and Whittle, Fleet street.]
Besides this account given by Mr. Maxwell, there are other testimonies to the magnitude of the Congo, shewing it to be a river of the first class, and larger probably than the Nile. In a journal (which the editor has seen) of an intelligent and respectable naval officer, Captain Scobell, who visited the coast of Africa in the year 1813, in H.M. sloop of war the Thais, the Congo is described as "an immense river from which issues a continued stream at the rate of four or five knots in the dry, and six or seven in the rainy season." In a subsequent passage he says, "In crossing this stream, I met several floating islands, or broken masses from the banks of that noble river, which, with the trees still erect, and the whole wafting to the motion of the sea, rushed far into the ocean, and formed a novel prospect even to persons accustomed to the phenomena of the waters." He adds, that there are soundings to the distance of from thirty or forty miles from the coast, arising probably from the vast quantity of alluvial matter brought down by the force of the stream.