subjects, believing that the old road is worn out and useless, seeks to strike out a new one for himself, and, in the effort, not only perhaps exhausts his strength, but is sure to incur the enmity of those who are bent on maintaining the ancient scheme unimpaired. To solve the great problem of affairs; to detect those hidden circumstances which determine the march and destiny of nations; and to find, in the events of the past, a key to the proceedings of the future, is nothing less than to unite into a single science all the laws of the moral and physical world. Whoever does this, will build up afresh the fabric of our knowledge, rearrange its various parts, and harmonize its apparent discrepancies. Perchance, the human mind is hardly ready for so vast an enterprise. At all events, he who undertakes it will meet with little sympathy, and will find few to help him. And let him toil as he may, the sun and noontide of his life shall pass by, the evening of his days shall overtake him, and he himself have to quit the scene, leaving that unfinished which he had vainly hoped to complete. He may lay the foundation; it will be for his successors to raise the edifice. Their hands will give the last touch; they will reap the glory; their names will be remembered when his is forgotten. 'It is, indeed, too true, that such a work requires, not only several minds, but also the successive experience of several generations. Once, I own, I thought otherwise. Once, when I first caught sight of the whole field of knowledge, and seemed, however dimly, to discern its various parts, and the relation they bore to each other, I was so entranced with its surpassing beauty, that the judgment was beguiled, and I deemed myself able, not only to cover the surface, but also to master the details. Little did I know how the horizon enlarges as well as recedes, and how vainly we grasp at the fleeting forms, which melt away and elude us in the distance. Of all that I had hoped to do, I now find but too surely how small a part I shall accomplish. In those early aspirations, there was much that was fanciful; perhaps there was much that was foolish. Perhaps, too, they contained a moral defect, and savored of an arrogance which belongs to a strength that refuses to recognize its own weakness. Still, even now that they are defeated and brought to nought, I cannot repent having indulged in them, but, on the contrary, I would willingly recall them if I could. For, such hopes belong to that joyous and sanguine period of life, when alone we are really happy; when the emotions are more active than the judgment; when experience has not yet hardened our nature; when the affections are not yet blighted and nipped to the core; and when