With extraordinary genius and industry, and admirable clear-sightedness and judgment, he set in their true light and pieced together the various items thus collected relating to the course of the Niger, till he succeeded in mapping out for himself the broad geographical features of the whole region through which it runs. As far back as 1816 the first sketch of his views was given to the world in a small treatise, in which he pointed out, as had Richard before him, that the Niger certainly entered the ocean in the Bight of Benin. The treatise fell unheeded, however--at least by the world at large; but undiscouraged, M‘Queen continued his researches for five years more, and in 1821 produced a book, “Containing a Particular Account of the Course and Termination of the Great River Niger in the Atlantic Ocean.” In this interesting work M‘Queen reviews all the various theories respecting the Niger. He demolishes Rennell’s opinion that it disappeared in some central wastes of sand, or becomes evaporated in a series of swamps under the burning heats of a tropical sun. The view that it flows east and joins the Nile met a similar fate before his army of facts. The obstructing Kong barrier was cleft asunder with a Titan’s strength, and made to separate instead of join the Congo and the Niger. But the writer was not merely destructive. He could build as well. With the very weapons with which he pulled down the theories of the past, he set about constructing a theory of his own. Laying together fact upon fact, gathered from every available source, he traced the course of the Niger in a southerly direction. Bussa, from being left near Timbuktu, he transported several hundred miles further south. From the kingdom of Bornu and adjacent states he gathered together the various drainage streams, and ran them into a common channel--the Gir or Nile of the Sudan; but instead of directing it to the true Nile, as had formerly been the case when it was believed to be the Niger itself, he gave it a westerly course south of the Haussa States and Nyffé (Nupé) to its junction with the Kwora or Main Niger. Here the Arab writers and traders failed him, though leaving him without a doubt as to the ultimate destination of the Central Sudanese waters. For the termination, however, he had to seek information from the Atlantic side. Everything pointed to the Bight of Benin as the only possible place of discharge of such a huge river. Here was found an unknown extent of low flat country and fetid mangrove swamp, pierced by many-branched anastomosing creeks. From Calabar to Benin canoes could pass in all directions by means of these creeks, and it was known that they extended far into the interior. Though subject to the ebb and flow of the tide, there was no question as to the volume of fresh water which moved seaward, bearing floating islands on its discoloured floods.