On comparing Mr. Maxwell's hypothesis respecting the Niger with that of M. Reichard, which we are now considering, the latter may be said to have gained something in point of probability, by diminishing the distance which the Niger has to flow in order to reach the Atlantic. But the length of its course, even when thus reduced, is still a considerable difficulty, and a great incumbrance on the hypothesis. The objection arising from the Niger's being conceived to penetrate the Kong Mountains, seems to be nearly of equal weight in both cases, on the supposition that this vast chain of mountains is of the extent generally imagined; which there appears to be no reason to doubt. It may be mentioned as an objection to both of these hypotheses, that no traces whatever of the Mahometan doctrines or institutions are now to be found on either of the coasts where the Niger is supposed to terminate. In no part of the world has the spirit of enterprise and proselytism, which properly belongs to the Mahometan character, been more strikingly displayed than in the extensive regions of North Africa. Its effects are every where conspicuous, not only in the religious belief of the greater part of the inhabitants; but even where Mahometism is not actually established, in their manners, and customs, and in the predominance of the Arabic language, which is almost every where grafted upon the native African dialects. These circumstances, however, are peculiar to North Africa; nothing of a similar kind having been remarked on the coast of Guinea, and still less on that of Congo and Angola. Mr. Maxwell also states in a letter to Mr. Park, that he had made enquiries of a great number of negroes who had come down the Congo from great distances; but that he could never hear of any Mahometan priests having visited the countries on the banks of that river. Supposing the Niger really to flow through the centre of Africa, and to discharge itself any where into the Atlantic, it is reasonable to believe that some of the Mahometan colonists must long since have established themselves on the banks of that river, and penetrated to the shores of the ocean. APPENDIX. No. V. The botanical specimens, mentioned in Park's letter, arrived safe in England, and were received by Sir Joseph Banks, by whose kind information the editor is enabled to add the following particulars concerning them.