The final solution of these problems of the geological status of Africa, and the great antiquity of man can but be of the greatest interest to all thoughtful persons. Unquestionably their solution will be greatly hastened, should Dr. Livingstone succeed in the great enterprise upon which he is now engaged, and soon make known to the world the true sources of the Nile. His success therein would stimulate endeavor, study, exploration, and, it is to be hoped, comprehensive and systematic surveys of a continent the evidences of whose civilization in remote ages lie buried among the debris of countless centuries. We know, from the imperfect investigations which have already been made, that cities have been engulfed in the sands of Sahara. We know that vast changes have taken place in the physical structure of the continent of Africa and of the world since the negro race first appeared. It is not improbable, therefore, that where for so many ages beasts of prey and savage tribes have occupied a land oppressed with heat and burdened with many ills, there may yet be found evidences of former civilization and power in greatest possible contrast to present barbarism and national weakness. And who shall say that when the face of the continent was changed, whether by a great convulsion or by a gradual process, some of the people did not migrate northward, cross the Mediterranean and populate the continent which has since become the abode of the highest civilization and the greatest intellectual culture? Who shall say that these races of remote antiquity were not possessed of culture and arts and literature placing them very high in the scale of civilization? Within the historic period those nations have passed away which were the acknowledged parents of modern culture and art. The power and versatility of the human mind, reason, eloquence, and poetry, were most sublimely illustrated by the Greeks, whose works still remain to benefit and instruct mankind. Yet the freedom and power of this wonderful people have for more than twenty centuries been annihilated. The people, in the eloquent diction of Macaulay, have degenerated into timid slaves; the language into a barbarous jargon; and the beautiful temples of Athens “have been given up to the successive depredations of Romans, Turks, and Scotchmen.” The vast empire of Rome has passed entirely away within a few centuries. She had herself annihilated Carthage leaving nothing, as we have seen, of the arts, literature, or institutions of a people whose ships had sailed on every wave from the Hellespont to the Baltic, and, not improbably, from the Mediterranean to the delta of the Mississippi. Other great nations are also known to have passed away or been destroyed, the nature of their civilization and institutions being left to conjecture based upon a few monuments or a few literary remains preserved by foreign writers. It being once established that man existed