The present century has so many distinguishing features that it is a hazardous undertaking to summarize its achievements. All branches of science—Philology, History, Mathematics, Medicine, Theology, and Philosophy—have felt the stimulating influence of a new spirit that made its appearance after the French Revolution. New methods of investigation have not only led to profound modification of views in all departments of science, but have brought about considerable additions to the sum of human knowledge. In the domain of natural science, the discovery of new principles and of hitherto unknown forces has widened the horizon of humanity and created new mental disciplines; but while perhaps less conspicuous, because not so directly connected with the actual concerns and needs of the present, the fertility of historical research during this century is not less remarkable. The larger area now embraced under the caption “history of mankind” furnishes the best proof for the success that has signalized the labors of scholars—philologists, historians, and explorers—devoted to the study of the past. Ancient history no longer begins with the Greeks or the Hebrews. Its _certain_ limits have been removed to as remote a date as 3000 B. C., while the anthropologist, supplementing the work of the historian, has furnished a picture in detail of the life led by man in various quarters of the globe during that indefinite period which preceded the rise of culture in the true sense of the word. This extension of knowledge in the domain of human history is primarily due to the spade of the explorer, though it required the patience and ingenuity of the philologist and archæologist to interpret the material furnished in abundance by the soil that happily preserved the records of lost empires. Documents in stone, clay, and papyrus have been brought forth from their long resting-places to testify to the antiquity and splendor of human culture. By the side of written records, monuments of early civilization have been dug up, palaces, forts, and temples filled with works of art and skill, to confirm by their testimony the story preserved by those who belonged to the age of which they wrote. [Illustration: THE “BLACK OBELISK” OF SHALMANESER II., KING OF ASSYRIA. B. C. 860–824. (British Museum.)]