modern astronomer is able to detect even in the course of the most erratic comet the resultant of the two opposing forces of the solar system, so this profound observer of the human heart was able to trace in the madness of revolution, the contests of a more pacific policy, and even in the horrors of anarchy, the direction given by the two elementary and opposing forces of the social system. Would we trace society still further as another combination of these elementary forces in different proportions gives its direction in the line of despotism, we must turn to the Roman Thucydides--to Tacitus, for a true knowledge of the internal machinery which regulates it under this form of government. Do we wish to obtain an accurate view of the motives which move masses to action? would we investigate man, not as an individual, but according to those common qualities of the human mind by which we may classify his species and genera, and by which only we must consider him if we would rightly estimate the effects of circumstances upon masses? Turn to either or to both of these historians, whose profound and searching analysis so rarely fails of detecting the motives to human action. In both we shall find the same deep philosophy, the same careful study of the human heart, and the same eagerness to utter truth when clearly conceived, without regard to the forms of expression; the great and distinctive difference is in the difference of temperament arising perhaps out of a difference of situation. The more fiery Roman gives you glowing sketches, not pictures--they flow from him with that careless haste so indicative of boundless wealth. Each sketch bears within itself the evidence of lofty conception, and shows in every line the traces of a master's hand whose rapid touch is too busy in embodying the forms with which his brain is teeming to waste its energies in those minuter cares so necessary for filling out a perfect picture. With rapid pencil he leaves perhaps a simple line, but it is the line of Apelles--the hand of the master was there. The conceptions of the rival Greek, like his, are lofty but more matured, and the same careless ease with a somewhat superior elegance, mark his execution. His coloring however is milder, and you are never struck with those startling contrasts of light and shade so peculiar to the Roman.